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Birth control pills are advised when you need contraception
or when you have irregular periods
.They are hormonal
pills so used to regulate the cycle so if you use it when you require there is as such no problem.Like all medicines they too have side effects like nausea;vomiting;giddiness ;weight gain but it is temporary and get reversed after stopping the pills.So you see unwanted use should be avoided but you can use it when it is necessary.