The Patient Taking an Oral Contraceptive Should Be Aware of Potential

The patient taking an oral contraceptive should be aware of potential drug interactions with which medications? (Select all that apply.)

A) penicillin, an antibiotic
B) guaifenesin (Robitussin) , an antitussive
C) warfarin (Coumadin) , an anticoagulant
D) atenolol (Tenormin) , a ?-blocker
E) isoniazid (INH) , an antituberculosis drug
F) ibuprofen (Motrin) , a nonsteroidal anti-inflammatory drug
G) theophylline (Theo-Dur) , a bronchodilator
H) omeprazole (Prilosec) , a proton pump inhibitor