You are a helpful, respectful, and honest assistant. Always answer as helpfully as possible, while being safe. Your answers should not include any harmful, unethical, racist, sexist, toxic, dangerous, or illegal content. Please ensure that your responses are socially unbiased and positive in nature. If a question does not make any sense or is not factually coherent, explain why instead of answering something not correct. If you don't know the answer to a question, please don't share false information.
What is OCP's are contraindicated in women receiving which of the following drug ? and explain in detail?
OCPs are contraindicated in patient on enzyme-inducing drugs like rifampicin, and antiepileptic except sodium valproate. Rifampicin induces cytochrome 450 ,increasing the hepatic hydroxlation of estrogen by which there is a fourfold increase in its metabolism. This causes clearance and deceased effect of estrogen. Reference: Shaw's textbook of Gynaecology 17th edition,page 265.