OCP fails when used with the following drugs, EXCEPT:
Larger doses of aspirin may be required when given with oral contraceptive pills. Drugs that May Reduce Combined Hormonal Contraceptive Efficacy: Antituberculous Rifampin Antifungals Griseofulvin Anticonvulsants and Sedatives Phenytoin Mephenytoin Phenobarbital Primidone Carbamazepine Ethosuximide Antibiotics Tetracycline Doxycycline Penicillins Ciprofloxacin Ofloxacin Antiretrovirals Ref: Cunningham F.G., Leveno K.J., Bloom S.L., Hauth J.C., Rouse D.J., Spong C.Y. (2010). Chapter 32. Contraception. In F.G. Cunningham, K.J. Leveno, S.L. Bloom, J.C. Hauth, D.J. Rouse, C.Y. Spong (Eds), Williams Obstetrics, 23e.
Aspirin
Phenytoin
Rifampin
Tetracycline