Anitbiotics and contaception (89/1700) (adapted)

A 23yo lady was prescribed rifampicin and she has recently started contraception to avoid
conception. Which of the following contraception method will be affected by rifampicin?

a. Barrier
b. IUCD
c. Progestogen injection
d. COCP

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answer: D (most affected)
Rifampicin-like medicines are the only type of antibiotic that can make some kinds of hormonal contraception less effective. They include:

rifampicin
rifabutin 

They affect:

the combined pill 
the progestogen-only pill
an implant
a patch 
a vaginal ring

Contraception methods that aren’t affected by rifampicin or rifabutin include:

the progestogen injection
an IUD (intrauterine device)
an IUS (intrauterine system)