892c7723__for_Professionals___Drugs_com__Drug_or_Test
[Interaction] Possible decreased efficacy of estrogen-containing oral contraceptives and increased incidence of breakthrough bleeding [Comments] Some clinicians suggest that a supplemental method of contraception be used in patients receiving oral contraceptives and ampicillin concomitantly, other clinicians state that most women taking oral contraceptives probably do not need to use alternative contraceptive precautions while receiving ampicillin [Drug or Test] 
Hormonal contraceptives
A l l o p u r i n o l
A m i n o g l y c o s i d e s
C h l o r a m p h e n i c o l
H o r m o n a l c o n t r a c e p t i v e s
M e t h o t r e x a t e
P r o b e n e c i d
S u l b a c t a m
S u l f o n a m i d e s
T e s t s f o r g l u c o s e
T e s t s f o r u r i c a c i d
Ampicillin Monograph for Professionals - Drugs.com