Our expert says:
It may well do so. I think you should check with your prescribing physician as there are a number of factors that can reduce absorption of contraceptives. Diarrhoea is one of them and if you find that you are developing diarrhoea, then you may be preventing uptake of the pill. Rather check with your dr. I would personally rather try to lose weight by eating a low-fat diet and doing exercise.
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