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*De
´partement d’Anesthe
´sie-re
´animation
CHU de Nancy
Hoˆ pital Central
29 Avenue de Lattre de Tassigny
54035 Nancy Cedex
France
Tel: 33-383-85-15-31
Fax: 33-383-85-10-39
E-mail: pm.mertes@chu-nancy.fr
Accepted for publication 3 December 2003
Allergy 2004: 59:1022–1023
Copyright Blackwell Munksgaard 2004
References
1. Laxenaire MC, Mertes PM. Anaphylaxis
during anaesthesia. Results of a two-year
survey in France. Br J Anaesth
2001;87:549–558.
2. Banchereau J, Steinman RM. Dendritic
cells and the control of immunity. Nature
1998;392:245–252.
3. Bernard J, Ittelet D, Christoph A,
Potron G, Adjizian JC, Kochman S
et al. Adherent-free generation of func-
tional dendritic cells from purified blood
monocytes in view of potential clinical use.
Hematol Cell Ther 1998;40:17–26.
4. Pichler WJ, Yawalkar N. Allergic
reactions to drugs: involvement of
T cells. Thorax 2000;55(Suppl. 2):
S61–S65.
Adverse reactions to vitamin
B12 injections due to benzyl
alcohol sensitivity:
successful treatment with
intranasal cyanocobalamin
S. E. Turvey*, B. Cronin, A. D. Arnold, F. J. Twarog,
A. F. Dioun
Key words: benzyl alcohol; cyanocobalamin; drug
reaction; hydroxycobalamin; vitamin B12.
A 16-year-old female was referred for
assessment of possible anaphylactic
reactions follow-
ing vitamin B12
injections. In
March 2001, the
patient received
an intramuscular
injection of vita-
min B12 (cyano-
cobalamin
1000 lg) and
experienced pain
at the injection site. In May 2001, 1 h
after her second injection, she reported a
sensation of substernal burning and
pleuritic pain that resolved over days.
Within minutes of her third injection in
June 2001, she felt similar chest discom-
fort and developed pruritus of the arms
and legs, but no rash.
As the reactions to cyanocobalamin
injections were becoming progressively
more serious, she was referred for
assessment. A number of allergic reac-
tions following parenteral administration
of vitamin B12 have been described (1–4).
Cobalamin is synthesized for therapeutic
use as either cyanocobalamin or hydrox-
ycobalamin. There are reports of patients
with reactions to one form of cobalamin
who have been able to tolerate the
alternate formulation (4–7). Unfortu-
nately, this management strategy was not
available to us as the hydroxycobalamin
preparation is not available in the United
States.
She was skin tested to three commer-
cial preparations of injectable cyanoco-
balamin and to the benzyl alcohol (0.9%)
preservative found in each. Prick testing
was negative (Table 1a), but intradermal
testing to all cyanocobalamin prepara-
tions and benzyl alcohol was positive
(Table 1b).
These results indicated that the patient
was likely reacting to the benzyl alcohol
preservative present in the cyanocobal-
amin injections. However, the data did
not eliminate the possibility of sensitiza-
tion to both the benzyl alcohol and
cyanocobalamin. Hypersensitivity reac-
tions to benzyl alcohol have been docu-
mented in patients treated with a variety
of medications containing benzyl alcohol
as a preservative (8, 9).
Although there was no commercially
available parenteral formulation of vita-
min B12 lacking the benzyl alcohol pre-
servative, we were fortunate to identify
Nascobal
(Questcor Pharmaceuticals
Intranasal
administration of
cyanocobalamin is an
option for vitamin
B12-deficient patients
sensitive to benzyl
alcohol.
Table 1. Skin test results
Patient Healthy control
(a) Skin prick testing results
Cyanocobalamin brand no. 1 (1 mg/ml) Negative Negative
Cyanocobalamin brand no. 2 (1 mg/ml) Negative Negative
Cyanocobalamin brand no. 3 (1 mg/ml) Negative Negative
Benzyl alcohol (0.9%) Negative Negative
Histamine (6 mg/ml) 10 mm wheal + flare 10 mm wheal + flare
Normal saline Negative Negative
(b) Intradermal testing results
Cyanocobalamin brand no. 1 (0.01 mg/ml) 7 mm wheal + flare Negative
Cyanocobalamin brand no. 2 (0.01 mg/ml) 6 mm wheal + flare Negative
Cyanocobalamin brand no. 3 (0.01 mg/ml) 10 mm wheal + flare Negative
Benzyl alcohol (0.009%) 9 mm wheal + flare Negative
Normal saline Negative Negative
ALLERGY Net
1023
Inc., Union City, CA, USA), a cyanoco-
balamin gel for intranasal administration
that does not contain benzyl alcohol. The
patient was skin tested to this nasal
preparation at its full concentration and
demonstrated no reaction. She was given
a test dose of 500 lg, with no adverse
reaction. Subsequently her vitamin B12
deficiency was successfully treated with
the nasal preparation of cyanocobalamin
as demonstrated by her relatively stable
levels of vitamin B12 since beginning
treatment (Fig. 1).
This patient’s reactions to benzyl
alcohol, along with previously reported
cases, confirm the importance of con-
sidering benzyl alcohol as a cause of
hypersensitivity reactions to parenteral
medications. Intranasal administration
of cyanocobalamin gel is an option for
vitamin B12-deficient patients who are
sensitive to benzyl alcohol.
*Division of Immunology
Children’s Hospital
300 Longwood Avenue
Boston MA 02115
USA
Tel: 617 355 5635
Fax: 617 232 3877
E-mail: stuart.turvey@tch.harvard.edu
Accepted for publication 5 January 2004
Allergy 2004: 59:1023–1024
Copyright Blackwell Munksgaard 2004
References
1. Hovding G. Anaphylactic reaction after
injection of vitamin B12. Br Med J
1968;3:102.
2. James J, Warin RP. Sensitivity to cyano-
cobalamin and hydroxocobalamin. Br
Med J 1971;2:262.
3. Woodliff HJ. Allergic reaction to cyano-
cobalamin injection. Med J Aust
1986;144:223.
4. Heyworth-Smith D, Hogan PG. Allergy
to hydroxycobalamin, with tolerance of
cyanocobalamin. Med J Aust
2002;177:162–163.
5. Vidal C, Lorenzo A. Anaphylactoid
reaction to hydroxycobalamin with toler-
ance of cyanocobalamin. Postgrad Med J
1998;74:702.
6. Tordjman R, Genereau T, Guinnepain
MT, Weyer A, Lortholary O, Royer I,
Casassus P, Guillevin L. Reintroduction
of vitamin B12 in 2 patients with prior B12-
induced anaphylaxis. Eur J Haematol
1998;60:269–270.
7. Branco-Ferreira M, Clode MH, Pere-
ira-Barbosa MA, Palma-Carlos AG.
Anaphylactic reaction to hydroxycobalam-
in. Allergy 1997;52:118–119.
8. Wilson JP, Solimando DA Jr, Edwards
MS. Parenteral benzyl alcohol-induced
hypersensitivity reaction. Drug Intell Clin
Pharm 1986;20:689–691.
9. Grant JA, Bilodeau PA, Guernsey BG,
Gardner FH. Unsuspected benzyl alcohol
hypersensitivity. N Engl J Med
1982;306:108.
Figure 1. Serum vitamin B12 levels and replacement schedule.
ALLERGY Net
1024