Can a contraceptive pill still work after using cystitis treatments?

You betcha. Good question. Do you mean antibiotics? Yes, the birth control pill still works when you are taking antibiotics [except for rifampin, but that's not used to treat bladder infections].
Not during, later OK. Women are advised that antibiotics taken for cystitis/utis may inactivate birth control pills and are advised to continue taking bcp but have partner use condoms for a month to remain safe. Then will be ok to rely on bcp.

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