Not all CYP isozymes respond equally to a particular inducer (Although variations in the extent of induction may differ between CYPs, there do appear to be common cellular signaling mechanisms. Enzyme induction will continue for as long as the patient takes the inducer and no‐one can predict the health problems that may arise throughout life’s journey. Several cross‐sectional and repeated‐measures studies have demonstrated elevated levels of total cholesterol, low‐density lipoprotein cholesterol and triglycerides among patients treated with phenobarbital, phenytoin, and carbamazepine relative to healthy controls (Other “non‐traditional” serologic measures appear also to be affected by enzyme induction. Clinical problems can occur due to pharmacokinetic interactions with other medications either on introduction of the inducer or due to its withdrawal. So when a woman’s levels of oestrogen are high, there may be a higher risk of seizures happening. The IUD is not affected by taking AEDS. S.S. 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