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Efficacy of niclosamide and ivermectin suspension preparations in sheep parasitoses

Authors:
  • Федеральный Алтайский научный центр агробиотехнологий, Россия, Барнаул

Abstract and Figures

Objective: This study aimed to examine the efficiency of newly formulated drugs based on mech¬anochemical modification of two widely used anthelmintic substances in suspension formulations against the main classes of helminths and parasitic arthropods. Materials and Methods: Solid-phase co-grinding of two substances, i.e., ivermectin (IM) and niclosamide (NS), with licorice extract and sodium succinate was performed in liquid-phase processing to obtain suspension formulations. Drug preparations were administered to the sheep of the experimental groups (5 experimental groups of 8 heads) with different concentrations of active substances, i.e., 3.0, 5.0, and 10.0 mg/kg of body weight (BW) NS and 0.2-mg/kg BW IM. Aqueous suspensions of the original substances in dosages of 0.2-mg/kg BW IM, 10.0-mg/kg NS, and placebo were included as controls. Efficacy of the formulations against gastrointestinal stron¬gyles, Trichuris spp., Moniezia spp., and nasal bot larvae (Oestrus ovis) was assessed in naturally infected sheep by the number of surviving adult parasites post-treatment in the gastrointestinal tract, nasal passages, and sinuses. Results: Formulated suspensions showed an increased solubility of 5.5–13.1 times compared to the original substances. Treatment of sheep with the SusIN-10 drug containing 0.2-mg/kg BW IM and 10.0-mg/kg NS showed 100% efficiency against gastrointestinal strongyles, Moniezia, and nasal bot larvae. Formulations containing 0.2-mg/kg BW IM and 3.0- and 0.5-mg/kg NS could eliminate all of the Trichuris worms. Administration of original substances of IM and NS with rec¬ommended dosages did not result in the adult parasites’ complete elimination. Conclusion: Modification of the anthelmintic substances through mechanochemical methods made it possible to create formulations with a targeted spectrum of action, significantly higher water solubility, and optimal parasiticidal activity.
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hp://bdvets.org/javar/ 1122
Marchenko et al. / J. Adv. Vet. Anim. Res., 11(4): 1122–1129, December 2024
JOURNALOFADVANCEDVETERINARYANDANIMALRESEARCH
ISSN2311-7710(Electronic)
hp://doi.org/10.5455/javar.2024.k863December 2024
A periodical of the Network for the Veterinarians of Bangladesh (BDvetNET) VOL11,NO.4,PAGES1122–1129
ORIGINALARTICLE
Ecacy of niclosamide and ivermecn suspension preparaons in sheep parasitoses
VictorA.Marchenko1,YuryA.Vasilenko1,IvanV.Biryukov1,MaratS.Khalikov2,
SalavatS.Khalikov2,AlirezaSazmand3
1Gorno-AltayResearchInstuteofAgriculture(branch)ofNaonalResearch,TomskStateUniversity,Barnaul,Russia
2A.N.NesmeyanovInstuteofOrganoelementCompounds,RussianAcademyofScience(RAS),Moscow,Russia
3DepartmentofPathobiology,FacultyofVeterinaryMedicine,Bu-AliSinaUniversity,Hamedan,Iran
Contact SalavatS.Khalikov khalikov_ss@ineos.ac.ru A.N.NesmeyanovInstuteofOrganoelementCompounds,RussianAcademyofScience(RAS),
Moscow,Russia.
AlirezaSazmand alireza.sazand@basu.ac.ir DepartmentofPathobiology,FacultyofVeterinaryMedicine,Bu-AliSinaUniversity,Hamedan,Iran.
How to cite this arcle: MarchenkoVA,VasilenkoYA,BiryukovIV,KhalikovMS,KhalikovSS,SazmandA.Ecacyofniclosamideandivermecnsuspensionpreparaons
insheepparasitoses.JAdvVetAnimRes2024;11(4):1122–1129.
ABSTRACT
Objecve:Thisstudyaimedtoexaminetheeciencyofnewlyformulateddrugsbasedonmech-
anochemicalmodicaonoftwowidelyusedanthelmincsubstancesinsuspensionformulaons
againstthemainclassesofhelminthsandparasicarthropods.
Materials and Methods:Solid-pha se co-grindingof two substances, i.e., ivermecn (IM) and
niclosamide(NS),withlicoriceextractandsodiumsuccinatewasperformedinliquid-phasepro-
cessingtoobtain suspension formulaons.Drug preparaonswereadministered tothe sheep
ofthe experimentalgroups(5experimentalgroups of8heads)withdierentconcentraonsof
acvesubstances,i.e.,3.0,5.0,and10.0mg/kgofbodyweight(BW)NSand0.2-mg /kgBWIM.
Aqueoussuspensionsoftheoriginalsubstancesindosagesof0.2-mg /kgBWIM,10.0-mg/kgNS,
andplacebowereincludedascontrols.Ecacyoftheformulaonsagainstgastrointesnalstron-
gyles,Trichurisspp.,Monieziaspp.,andnasalbotlarvae(Oestrus ovis)wasassessedinnaturally
infectedsheepbythenumberofsurvivingadult parasitespost-treatmentinthegastrointesnal
tract,nasalpassages,andsinuses.
Results:Formulatedsuspensionsshowedanincreasedsolubilityof5.5–13.1mescomparedto
theoriginalsubstances.TreatmentofsheepwiththeSusIN-10drugcontaining0.2-mg/kgBWIM
and 10.0-mg/kg NS showed 100% eciency against gastrointesnal strongyles, Moniezia, and
nasal bot larvae. Formulaons containing0.2-mg /kg BW IM and 3.0- and 0.5-mg/kg NS could
eliminatealloftheTrichurisworms.AdministraonoforiginalsubstancesofIMandNSwithrec-
ommendeddosagesdidnotresultintheadultparasites’completeeliminaon.
Conclusion: Modicaon of the anthelminc substances through mechanochemical methods
madeit possibleto createformulaonswith atargetedspectrumofacon,signicantlyhigher
watersolubility,andopmalparasicidalacvity.
ARTICLE HISTORY
ReceivedMarch17,2024
RevisedNovember01,2024
AcceptedDecember14,2024
PublishedDecember29,2024
KEYWORDS
Drugtesng;helminth;
mechanochemistry;ovine;
parasicidalacvity
Introducon
Parasitic diseases are major constraints in sheep farming
worldwide. Considering the prevalence of mixed infections
with different parasite taxa, the administration of com-
plex antiparasitic preparations with a wide spectrum of
activity is necessary. The use of multi-taxa-affecting drugs
based on different substances makes it possible to affect
the entire spectrum of parasites with a reduced volume of
drug use and reduced frequency of animals’ manipulations
[1]. It has been shown that most antiparasitic substances
are organic compounds poorly soluble in water [2]; hence,
to achieve the desired therapeutic effect, it is always nec-
       
substance in the preparation, which leads to an increase
in the product cost and, importantly, the release of higher
amounts of the unchanged drugs and their metabolites
into the environment [3].
To improve the solubility of antiparasitic substances
and their pharmacokinetic properties, and also increase
the effectiveness of various physicochemical meth-
ods, such as reducing the size of crystalline particles to
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Marchenko et al. / J. Adv. Vet. Anim. Res., 11(4): 1122–1129, December 2024
nano-size by grinding and obtaining dosage forms such as
nanosuspensions, microcapsules, etc. [4], preparing solid
lipid nanoparticles and nanocapsules [5,6], designing poly-
meric forms of drugs in the form of micelles [7], and form-
ing solid dispersions (SDs) of medicinal substances [8] are
used. The compositions obtained with these methods will
       
disadvantages of low bioavailability, poor cell permeabil-
-
parasitic drugs from the body [9].
     -
zole (FBZ)—a broad-spectrum dewormer that is used to
treat many intestinal parasites—by joint grinding with
licorice extract (LE) and sodium dioctyl sulfosuccinate
       -
tions [10], and we believe that the solubility of niclosamide
(NS)—an anthelmintic medication used to treat tapeworm
infections—will increase the same way. Licorice is a plant
containing 25% glycyrrhizic acid (GA) and is known to
have a wide range of biological activities, which helps to
improve the membrane conductivity of medicinal sub-
stances [11]. Na-DSS, on the other hand, is used as an
   
antihypoxic and antioxidant effect [12].
Internal parasites complex of sheep in the farms of
the region is represented by all the main taxa with fairly
constant infection rates: nematodes (60%–80%), trem-
     
(65%–75%). In particular, 84%–94% of the sheep raised
in this territory (Ust-Koksinsky region) were previously
reported to be infected by Oestrus ovis larvae in their nasal
passages and sinuses [13]. Therefore, it is advisable to con-
duct research not only on the synthesis and search for new
anthelmintic substances, which is an extremely expensive
        
and the production of complex preparations from several
substances with different mechanisms of action.
The aim of this study was to obtain complex therapeu-
tic drugs based on substances of ivermectin (IM) and NS
and test their parasiticidal activity against common para-
sitic infections of sheep, i.e., nematodes and cestodes of the
O. ovis
(Linnaeus 1758) in the Altai Mountains.

of newly formulated drugs based on the mechanochemical
 
IM and NS, in suspension formulations against the main
classes of helminths and parasitic arthropods.
Materials and Methods
Ethical approval
This study was approved by the State order of the Federal
     
and the FASCA Bioethics Commission, order No. 210, dated
October 12, 2022. All applicable international, national,
and/or institutional guidelines for the care and use of ani-
mals were followed.
Materials
IM substance was purchased from Shandong Qilu King-
Phar Pharmaceutical Co. Ltd. (Shandong, China). NS
substance was obtained from Ghangzhou Yabang-Qh

powder of dark brown color with a content of 25% GA—
was taken from Visterra Ltd. (Altay, Russia). Na-DSS was
purchased from Acras Organics (New Jersey, USA). Sodium
salt of carboxymethyl cellulose (Na-CMC = blanose) was

The target composions in the form of aqueous suspen-
sions were obtained as follows
First, the solid-phase mechanochemical treatment of the
IM and NS substances was carried out with LE (stage 1)
and further addition of Na-DSS (stage 2) under the con-
ditions described earlier [16]. The obtained SD composi-
tions IM:LE (1:9) and NS:LE (1:9), which are light brown
powders with increased solubility of substances (Table 1),
were subjected to further mechanical processing by add-
ing the appropriate amount of Na-DSS to obtain the com-
positions IM:LE:Na-DSS (1.0:8.8:0.2) and NS:LE:Na-DSS
(1.0:8.8:0.2). The products of mechanical processing were
SD, which had an increased solubility (Table 1). Obtained
SD were used to obtain the corresponding single suspen-
sion formulations of IM (SusI), containing 2.9% IM, and
NS (SusN), containing 3.4% NS. Afterward, complex sus-
pension formulations were prepared from single suspen-
sions previously obtained, taking into account the required
dosage of drugs. Three suspensions with the abbreviation
Suspension of Ivermectin and Niclosamide (SusIN) were
achieved, i.e., SusIN-3 (at the rate of 0.23 mg of IM and 3.51
mg of NS in 1 ml of suspension), SusIN-5 (at the rate of 0.23
mg of IM and 5.85 mg of NS in 1 ml of suspension), and
SusIN-10 (at the rate of 0.23 mg of IM and 11.7 mg of NS in
1 ml of suspension).
To administer as controls, suspension samples of the
initial substances (without LE and Na-DSS) were prepared
by suspending IM and NS separately using a rotary stirrer
in a 0.2% aqueous polymeric solution of Na-CMC at the
rate of IM: 0.23 mg and NS: 11.7 mg in 1 ml of suspension.
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Marchenko et al. / J. Adv. Vet. Anim. Res., 11(4): 1122–1129, December 2024
Solubility study
The solubility of the resulting SD was determined by the
 
of the SD in water for 3 h by high-performance liquid chro-
matography on an Agilent 1,200 chromatograph with a
Zorbax Eclipse XDB-C18 column, 4.6 × 50 mm (Agilent
Technologies, CA, USA); column temperature +30°C;
diode-matrix detector. An acetonitrile acetate buffer pH

min, and the sample volume was 5 µl [14]. The analysis
error was ±3%.
Determinaon of parcle sizes in soluons of the suspen-
sion formulaons
Dynamic light scattering (DLS) technology [15] was used
to estimate the average particle size and polydisper-
sity index of obtained suspension formulations by the
Photocor Complex Instrument (Photocor, Moscow) at
25°C. The compositions were dissolved in distilled water
before measurement. The results were obtained by mea-
suring three times and taking the average value.
Study animals
Previous studies in the Altai Mountains reported the
maximum infection of helminths and O. ovis larvae to
occur between September and October, during which
antiparasitic treatments of sheep are recommended [1].
Henceforth, we chose this optimal period for assessing the
effectiveness of the drugs.
A randomized and placebo-controlled study was car-
           
agricultural production cooperative “Amur” in the Ust-
Koksinsky district of the Altai Republic in accordance with
the Guidelines for the Experimental (Preclinical) Study of
New Pharmacological Substances [16] and the European
Convention for the Protection of Vertebrate Animals Used
      [17].
During the experiment, the sheep did not graze on the
pasture; they were kept indoors and fed according to the
norms and rations for feeding livestock [18].
Fifty sheep of the Gorno-Altai breed aged 16–18
months weighing 35–40 kg were included. Three days
before the experiment, individual rectal fecal samples from
20 randomly selected animals were examined according
to Kotelnikov–Khrenov’s method using a VIGIS counting
chamber. Results showed infection with gastrointestinal
strongyles in 55.0% (mean EPG = 75.2), Trichuris in 30.0%
(mean EPG = 32.5), and Moniezia in 20.0% (mean EPG =
41.3) of animals. The relatively low infection rate is most
likely due to the grazing of animals in the summer on high
alpine pastures. Five experimental groups of 8 sheep and
1 control group of 10 sheep with close infection rates were
randomly formed.
Treatments of animals
Suspension preparations (SusIN) were fed to the sheep
of the experimental groups at a dosage according to the
NS—3.0, 5.0, and 10.0 mg/kg body weight (BW) and IM
at 0.2-mg/kg BW. Aqueous suspensions of the original
substances were used in dosages of IM—0.2-mg/kg BW,
NS—10.0-mg/kg BW, and placebo (control group) in the
form of 0.2% blanose were also fed to animals with the
same volume as SusINs.
For assessment of possible side effects, clinical param-
eters, such as temperature, pulse rate, respiration rate,
rumen movement, and behavior, were checked before and
on days 1, 3, and 5 post-treatment in the morning before
feeding according to the method of veterinary clinical lab-
oratory diagnostics [19].
Study of the parasical acvity of drugs
       
days post-treatment after slaughter at a local meat pro-
cessing plant by naked-eye examination of the abomasum,
small, and large intestines. At the same time, the mucous
membranes of the nasal and adnexal cavities of the sheep

proportion of infected animals, arithmetic and geometric

recovered parasites were recorded [20].
Table 1. SolubilityinthewaterofSDsamplesbasedonIMandNS.
Sample, its composion, preparaon condions, and content of IM and NS Water solubility
Absolute (mg/l) Increased (mes)
IM(inialsubstance),97.5%IM 4.0
SDoftheIM:LE(1:9)aer3hofmechanicaltreatment;10.0%IM 21.9 5.5
SDoftheIM:LE:Na-DSS(1.0:8.8:0.2)aer3hofmechanochemicaltreatment;10.0%IM 52.4 13.1
NS(inialsubstance),98.0%NS 5.0
SDoftheNS:LE(1:9)aer3hofmechanochemicaltreatment;10.0%NS 6.5 1.5
SDoftheNS:LE:Na-DSS(1.0:8.8:0.2)aer3hofmechanochemicaltreatment10.0%NS 31.3 6.3
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Parasiticidal activity evaluation based on the calculation
of two effectiveness indicators as used previously [1]: IE %
= decrease in the arithmetic mean number of parasites of
the experimental groups in relation to the control and EF
% = decrease in the geometric mean number of parasites
of the experimental groups in relation to the control.
To compare the differences between the experimental
and control groups of animals, a t-test was used in SAS/
Stat software (SAS version No. 9, System for Windows).
p      
differences. The use of two methods for calculating the
effectiveness (EF and IE) allows you to more fully judge the
parasiticidal activity of drugs.
Results
Analysis of the solubility of SD
     -
tions containing IM and NS increased 5.5 and 1.5 times
after co-grinding of LE with the original substance.
Additionally, after the addition of Na-DSS to the SDs, the
solubilities increased by a factor of 13.1 and 6.3. Hence, two
compositions, IM:LE:Na-DSS (1:8.8:0.2) and NS:LE:Na-DSS
(1:8.8:0.2), were chosen for biological testing (Table 1).
Preparaon of suspension formulaons
Samples of aqueous suspensions of SusIN were prepared
from previously obtained SD by suspending them with a
rotary mixer and loading the calculated amounts of these
SDs. The corresponding SusIN suspensions were obtained
and presented in the calculated volume per kg of sheep
BW as follows: i) 0.83 ml of SusIN-3 suspension contained
0.2-mg IM and 3.0-mg NS; ii) 0.83 ml of SusIN-5 suspen-
sion contained 0.2-mg IM and 5.0-mg NS; and iii) 0.83 ml
of SusIN-10 suspension contained 0.2-mg IM and 10.0-mg
NS.
The particle size of the resulting suspensions was deter-
mined as 225 ± 40 nm according to the DLS technology
[15] using Photocor Compact-Z (Fotokor, Moscow, Russia).
The size distribution of the particles in the aqueous sus-
pension of SusIN-10 is shown in Figure 1.
According to DLS results, a narrow monodisperse size
distribution (225 ± 40 nm) was observed for nanosuspen-
sion particles based on LE and Na-DSS. It can be assumed
that these are the micelles of GA, the content of which in LE
is about 25%. This is consistent with previous studies on
the sizes of GA micelles [21].
Clinical data
Examined health parameters of the animals remained
within the physiological range.
Parasitological data
Parasiticidal activity of drugs in the case of the gastro-
intestinal tract strongyles is shown in Table 2. When
examining the gastrointestinal tracts of sheep in the experi-
mental and control groups, the adult stages of Teladorsagia,
Trichostrongylus, Nematodirus, Oesophagostomum, and
Chabertia  -
viving adult parasites in the experimental groups, calcu-
       
Figure 1. DLS measurement of particle size of aqueous suspension of SusIN-10.
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Marchenko et al. / J. Adv. Vet. Anim. Res., 11(4): 1122–1129, December 2024
was not feasible. Therefore, the total number of infected
animals and the total count of all adult helminths of the
   
In experimental groups 2 (SusIN-3) and 4 (SusIN-10), all
performance indicators were 100%. The effectiveness of
the SusIN-5 suspension (group 3) was also quite high, as
an IE% of 97.4 and an Ef% of 92.3 were recorded. Although
the original form of IM (group 5) showed effectiveness, the

3, SusIN-5, and SusIN-10 groups. As expected, administra-
tion of the original substance of NS (group 6) at a dosage of
10-mg/kg BW was not effective.
Inspection of the large intestines revealed that in
experimental groups 2 (SusIN-3) and 3 (SusIN-5), all per-
formance indicators were 100%. The effectiveness of the
SusIN-10 suspension (group 4) was also good, i.e., both
quite IE and Ef >91%, but unchanged IM (group 5) at the
-
cacy (IE = 82.0% and Ef = 60.4%). Suspension of substance
NS (group 6), at a dosage of 10-mg/kg BW with trichurosis,
did not show parasiticidal activity (Table 3).
With regard to the cestocidal effect of the formulations,
unchanged NS with a dose of 10 mg/kg BW, also SusIN-3
       
SusIN-10, however, proved to be effective in the removal of
all adult tapeworms (Table 4).
When examining the mucous membranes of the nasal
passages, ethmoid bones, and adnexal cavities of the sheep
heads, 1st and 2nd instar larvae of O. ovis were found in
all groups except animals receiving SusIN-5 and SusIN-10
    
original substance of IM was also acceptable (Table 5).
Table 2. Eciencyofsamplesofsuspensionsingastrointesnalstrongylosisofsheep.
Experiment number/
group of animals # in group Test product Dose (mg of acve substance/
kg BW)
# remaining
parasitesaIEc % Efd % p-valuee
1/Control 10 Placebo 0 19.1±6.8
1.3±0.17 ---
1/Treatment 8 SusIN-3 ModiedIM0.2
ModiedNS3.0
0
0100 100 NAf
2/Treatment 8 SusIN-5 ModiedIM0.2
ModiedNS5.0
0.5±0.27
0.1±0.08 97.4 92.3 <0.01
3/Treatment 8 SusIN-10 ModiedIM0.2
ModiedNS10.0
0
0100 100 NA
4/Treatment 8 SusIM OriginalsubstanceIM0.2 1.3±0.5
0.34±0.13 93.2 73.9 <0.01
5/Treatment 8 SusNS OriginalsubstanceNS10.0 17.8±5.6
1.1±0.15
6.8 15.4 >0.05
aNumberofparasites—thenumeratoristhearithmecmeanandthedenominatoristhegeometricmeannumberofparasites;bEE:extensiveeciency,the
proporonofanimalsfreedfromparasitesinrelaontothecontrol;cIE:intensityeciency,decreaseintheaverage(arithmec)indicatorofthenumberof
eggsinrelaontocontrol;dEf:decreaseinthegeometricmeanvaluesofthenumberofhelmintheggsoftheexperimentalgroupsinrelaontothecontrol;e
stascallysignicantatp≤0.05whengeometricmeanswerecomparedtoplacebo;fNA:stascalanalysiswasnotperformed.
Table 3. Ecacyofsuspensionsamplesinsheeptrichurosis.
Experiment number/
group of animals # in group Test product Dose (mg of acve substance/
kg BW)
# remaining
parasitesaIEc % Efd % p-valuee
1/Control 10 Placebo 0 6.2±2.8
1.16±0.09 ---
1/Treatment 8 SusIN-3 ModiedIM0.2
ModiedNS3.0
0
0100 100 NAf
2/Treatment 8 SusIN-5 ModiedIM0.2
ModiedNS5.0
0
0100 100 NA
3/Treatment 8 SusIN-10 ModiedIM0.2
ModiedNS10.0
0.37±0.26
0.1±0.1 94.1 91.4 <0.01
4/Treatment 8 SusIM OriginalsubstanceIM0.2 1.12±0.6
0.46±0.09 82.0 60.4 <0.05
5/Treatment 8 SusNS OriginalsubstanceNS10.0 6.75±3.2
1.04±0.17
0.0 0.0 NA
a-fFortheabbreviaonsseefootnotesofTable2.
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Discussion
The diverse taxonomic composition of the internal parasite
complex in sheep, comprising nematodes, cestodes, trem-
atodes, and nasopharyngeal myiasis, necessitates the use
of broad-spectrum antiparasitic compounds for effective
treatment. Therefore, in this study, we formulated mech-
   
joint grinding with LE and Na-DSS and showed that the
     
for the elimination of target parasites in comparison with
original unchanged drugs given at recommended doses.
This observation can be explained by increased water sol-
ubility of the suspension forms, i.e., by a factor of 13.1 for
IM:LE:Na-DSS and 6.3 for NS:LE:Na-DSS compared to the
initial substances, which leads to higher bioavailability and
consequently antiparasitic activity [22,23].
In this regard, LE might have played an important role
in increasing the solubility of the suspension forms, i.e., by
a factor of 5.5 for IM:LE and 1.5 for NS:LE compared to the
initial substances. Indeed, LE contains 25% of a naturally
occurring metabolite, GA, which is a widely used medicinal

anti-allergy agent, and anti-psoriatic agent [24]. GA has the
ability to change the properties of cell membranes, even at
micromolar concentrations, and it can provide new insight
into the mechanism of enhancement of drug bioavailability
in the presence of GA. Researchers suggest this substance
as an effective drug carrier, which enhances the solubility
of low-soluble drugs, as well as enhances their penetration
through cell membranes [11]. Previous studies showed
that using GA and its derivatives for the mechanochemi-
-
tributes not only to increasing their solubility but also to
       
Table 4. Ecacyofsuspensionsamplesinsheepmonieziosis.
Experiment number/
group of animals # in group Test product Dose (mg of acve substance/
kg BW)
# remaining
parasitesaIEc % Efd % p-valuee
1/Control 10 Placebo 0 0.9±0.48
0.46±0.09 ---
1/Treatment 8 SusIN-3 ModiedIM0.2
ModiedNS3.0
1.0±0.5
0.42±0.06 0.0 0.0 NAi
2/Treatment 8 SusIN-5 ModiedIM0.2
ModiedNS5.0
0.62±0.32
0.2±0.1 31.2 56.5 >0.05
3/Treatment 8 SusIN-10 ModiedIM0.2
ModiedNS10.0 0.0 100 100 NA
4/Treatment 8 SusIM OriginalsubstanceIM0.2 0.87±0.4
0.3±0.12 3.4 34.8 >0.05
5/Treatment 8 SusNS OriginalsubstanceNS10.0 0.62±0.42
0.39±0.09 31.2 15.3 >0.05
a-fFortheabbreviaons,seethefootnotesofTable2.
Table 5. Ecacyofsuspensionsamplesinsheepestrosis.
Experiment number/
group of animals # in group Test product Dose (mg of acve substance/
kg BW)
# remaining
parasitesaIEc % Efd % p-valuee
1/Control 10 Placebo 0 11.2±2.8
1.18±0.06 ---
1/Treatment 8 SusIN-3 ModiedIM0.2
ModiedNS3.0
0.86±0.49
0.26±0.16 92.4 78.0 <0.05
2/Treatment 8 SusIN-5 ModiedIM0.2
ModiedNS5.0 0.0 100 100 NAi
3/Treatment 8 SusIN-10 ModiedIM0.2
ModiedNS10.0 0.0 100 100 NA
4/Treatment 8 SusIM OriginalsubstanceIM0.2 1.13±0.58
0.46±0.09 89.9 61.1 <0.01
5/Treatment 8 SusNS OriginalsubstanceNS10.0 10.6±3.6
1.05±0.14 5.4 11.1 >0.05
a-fFortheabbreviaons,seethefootnotesofTable2.
hp://bdvets.org/javar/ 1128
Marchenko et al. / J. Adv. Vet. Anim. Res., 11(4): 1122–1129, December 2024
been reported that complexing praziquantel (PZQ), the
most commonly used anthelmintic drug for treating trem-
atodoses, with disodium glycyrrhizinate in the 1:10, ratio
had higher bioavailability than PZQ substance and reduced
the number of Opisthorchis felineus helminths in the liver
by 87% [25,26]. In another study, joint mechanochemical
treatment of PZQ with disodium salt of GA (Na2GA) led to
   
particle sizes, amorphization of substance, incorporation

      -
idant effects [12] was another substance we employed
to increase the water solubility of the formulations.
        
FBZ:LE:Na-DSS led to increased solubility of FBZ up to
27 times, which contributed to an increase in its perme-
ability through biological membranes and an increase in
the activity of the drug [10]. The reason behind the higher
anthelmintic action of FBZ:LE:Na-DSS was explained to be
the smaller size of FBZ, loss of crystallinity, amorphization,
and inclusion of its molecules on the surface and inside the
pores of polymers; the increase in solubility and permea-
bility through biological membranes [27].
As a limitation, in this study, we did not examine the
parasitocidal effectiveness of the formulations against
  
sheep ked Melophagus ovinus, which are common and
widespread. Future studies are needed to elucidate this
issue. Such results were achieved using data known in the
       
various methods.
Conclusion
This study demonstrated that the mechanochemical sol-

can lead to the development of new complex antiparasitic
        
       
frequency of treatment, thereby minimizing the negative
impact on the animals and promoting higher standards
of animal welfare. Furthermore, the preparation of drugs
using this technology is waste-free and safe both for pro-
duction and the environment [28].
List of abbreviaons
BW, body weight; DLS, dynamic light scattering; EE, exten-

of the number of helminth eggs of the experimental groups
in relation to the control; EPG, egg per gram of feces;
      -
ogy; FBZ, fenbendazole; GA, Glycyrrhizic acid; IE, Intensity
      
Sodium dioctylsulfosuccinate; Na-CMC, Sodium salt of car-
boxymethyl cellulose; NS, niclosamide; PZQ, praziquantel;
SD, solid dispersion; SusIN; suspension of ivermectin and
niclosamide.
Acknowledgments
The research was carried out within the framework of
         
Agrobiotechnology (FASCA) No. 0790-2019-0037 with the
support of the Ministry of Science and Higher Education of
the Russian Federation (Contract No. 075-00277-24-00).
Conict of interests
        
had no role in the design of the study; in the collection,
analyses, or interpretation of data, in the writing of the
manuscript, or in the decision to publish the results.
Authors’ contribuon
Conceptualization, VAM and SSK; methodology, VAM, AS,
and SSK; validation, SSK and AS; formal analysis, VAM,
AS, and SSK; investigation, YAV, IVB, VAM, and MSK; writ-
ing-original draft preparation, VAM and SSK; writing-re-
view and editing, SSK and AS; visualization, VAM, AS,
and SSK; supervision, VAM and SSK; project administra-
tion, VAM and SSK; funding acquisition, VAM and SSK. All
authors have read and agreed to the published version of
manuscript.
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Article
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Controlling the solubility of poorly water-soluble drugs remains one of the major challenges in the development of new effective drugs. The use of polymers is one of the promising routes for increasing the solubility of drug substances. This review summarizes the results of investigations on the application of oligosaccharides, polysaccharides, and other polymers to increase the solubility and bioavailability of anthelmintic drugs, which relate to different classes of organic compounds, by mechanochemical methods.
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Because of the rapid development of nanotechnologies, materials, in particular, solid dispersions (SDs), which are actively introduced into the life of modern man, have been obtained. Special progress in this area is observed in industry and medicine. The use of SDs in agriculture is lagging far behind, despite the growing number of scientific papers on this topic. At the same time, the prospects for the introduction of SDs in the agro-industrial complex are obvious. The review presents the results of research on the development of innovative preparations based on SD to protect plants from diseases and pests of cultivated plants, as well as parasiticides to protect animal health based on modern achievements of nanotechnology. One of these technologies is the methods of mechanochemistry, which improve the properties of poorly soluble biologically active substances by their joint mechanical treatment with water-soluble polymers and auxiliary substances.
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Most drug substances are poorly soluble in water so that their efficacies must be improved by increasing the dosage, which not only creates economic problems but also increases the toxicity of the future medicine. These problems can be solved by developing various dosage forms, which involves additional financial costs, complicates the technology, increases development times to introduce the future medicine, etc. Another approach to improving the solubility of such drug substances is the development of methods and technologies for producing solid dispersions of these drug substances with excipients (polymers, dispersants, surfactants, etc.). The present review covers the development and application of mechanochemical technology to modify sparingly soluble anthelmintic drugs. The technology consists essentially of joint mechanical treatment of a drug substance and polymer in grinder-activators of controlled energy. This technology uses one stage and avoids the use of solvents, heating, evaporation, etc. The resulting solid dispersions include supramolecular systems with increased solubility and better bioavailability and are also highly active with reduced consumption of the active ingredients.
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A large number of hydrophilic and hydrophobic carriers in pharmaceutical excipients are available today which are used for formulation of solid dispersions. Depending on nature of carriers the immediate release solid dispersions and/or controlled release solid dispersions can be formulated. Initially crystalline carriers were used which are transformed into amorphous solid dispersions with enhanced properties. The carriers used previously were mostly synthetic one. Recent trend towards the use of natural carriers have replaced the use of synthetic carriers. This review is the overview of various synthetic, natural, semisynthetic, modified natural hydrophilic carriers used for formulation of solid dispersions.
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Background Praziquantel (PZQ) is the most commonly used anthelmintic drug for treating trematodiases. It was shown here that PZQ in complex with disodium glycyrrhizinate (PZQ-Na2GA, in the 1:10 ratio) has higher bioavailability than PZQ alone. Our aim was to determine the effects of three-time administration of PZQ-Na2GA in an experimental opisthorchiasis felinea model.Methods The PZQ-Na2GA complex (1:10) at a 400 mg/kg dose (meaning 36.4 mg/kg PZQ) was administered to Opisthorchis felineus-infected hamsters three times under a “9:00 am–6:00 pm–9:00 am” regimen (PZQ-Na2GA × 3). Effects of treatment were assessed as a reduction of helminth load in the hamsters and as changes in physiological, hematological, and blood biochemical parameters. The helminths extracted from the liver of the hamsters that received PZQ-Na2GA thrice were assayed for sensitivity to PZQ in vitro.ResultsPZQ-Na2GA × 3 reduced the number of O. felineus helminths in the liver by 87%, which is 30% better than a previously reported effect of one-time administration of the complex. Meanwhile, relative weights of the liver and thymus diminished, and some hematological parameters improved. The helminths extracted from the hamsters 1 month after the PZQ-Na2GA × 3 treatment showed elevated sensitivity to PZQ, as determined in vitro.Conclusion Compared with previously published data on the effectiveness of various drugs in experimental opisthorchiasis felinea, PZQ-Na2GA × 3 exerts the most potent anthelmintic effect. In addition, PZQ-Na2GA × 3 improves physiological status of O. felineus-infected hamsters and sensitizes the surviving parasites to subsequent PZQ treatment.
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Introduction Most drugs used in therapy have low water-solubility, a factor that could reduce their dissolution rate and oral bioavailability, representing a challenge in pharmaceutical development. Nanonization of drugs is the reduction of particles to nanoscale, increasing the surface area and consequently the saturation solubility and dissolution rate and resulting in higher bioavailability. Areas covered This review provides an overview of the consequences of the poor water-solubility and the main strategies applied to increase the solubility of poorly water-soluble drugs. The relationship between the biopharmaceutical classification system and the solubilization process of the drug is also considered. Finally, it includes how drug nanoparticles and nanocarriers, especially lipid-based nanosystems, can overcome these challenges and which of these approaches are already available on the market. Expert opinion Due to the growing importance of nanomedicines, especially for applications in poorly water-soluble drugs, it is important to clearly establish the specifications and quality criteria for nanonized drugs to ensure the quality and safety of nanoparticles.