Abstract
The need to maintain long-term treatment of chronic pathologies makes the appearance of interactions possible when such therapies incorporate other drugs to deal with the aggravation of the same or other intercurrent pathologies. A case is presented in which the addition of trazodone to a chronic treatment with carbamazepine (CBZ) is associated with symptoms typical for intoxication by this antiepileptic, accompanied by a raised serum concentration. When the trazodone was suspended, these symptoms lessened and the concentration of CBZ decreased progressively, suggesting a probable interaction between the 2 drugs.
Key words
carbamazepine - trazodone - drug interaction
References
-
1
Horn JR, Hansten PD, Chan LN.
Proposal for a new tool to evaluate drug interaction cases.
Ann Pharmacother.
2007;
41
674-680
-
2
Karch FE, Lasagna L.
Toward the operational identification of adverse drug reactions.
Clin Pharmacol Ther.
1977;
21
247-254
-
3
Leite SAO, Leite PJM, Rocha GA. et al .
Carbamazepine kinetics in cardiac patients before and during amiodarone.
Arq Neuropsiquiatr.
1994;
52
210-215
-
4
Naranjo CA, Busto U, Sellers EM. et al .
A method for estimating the probability of adverse drug reactions.
Clin Pharmacol Ther.
1981;
30
239-245
-
5
Otani K, Ishida M, Kaneko S. et al .
Effects of carbamazepine coadministration on plasma concentration of trazodone and its active metabolite, m-chloro-phenylpiperazine.
Ther Drug Monit.
1996;
18
164-167
-
6
Sánchez-Romero A, García-Delgado R, Flores-Peña M.
Interaction between trazodone and carbamazepine.
Ann Pharmacother.
1999;
33
1370
Correspondence
Alberto Sánchez-RomeroMD
Clinical Pharmacology Service
University General Hospital
Albacete
Spain
Email: asanchez@sescam.jccm.es