The drug which may not interfere with the efficiency of oral contraceptives is?
Barbiturates
Rifampicin
Ampicilin
Amoxicillin
Oral contraceptives also called birth control pills, are a safe and reliable option for preventing unwanted pregnancy.
Rifampicin, also known as rifampin, is an antibiotic used to treat several types of bacterial infections, it can lower the effectiveness of the pill.
Oral contraceptives (birth control pills) containing estrogen may not work properly if you take them while you are taking barbiturates.
amoxicillin won't change the effectiveness of your birth control
Ampicillin can make birth control pills less effective.
Therefore, Option(4) is correct.