Discussions that mention levlen

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I have been taking my birth control pills (Levlen) continiously now to stop my periods for 3 months without any problems but last week I started taking 30mg of duromine (phentermine in the US) and have started bleeding for the past three days. Could the duromine have effected my pill and caused the bleeding or does duromine have no effect over the pill. Any advice is greatly appreciated.