Hi,
There are no harms to take i-pill(no reaction),but the t.b medicines reduces the efficacy of emergency contraceptive and the dose of i-pill might be needed to be repeated depending on how patient profile.
Repeat dose of i-pill might be recommended,but only after prescription,as repeat dose may also cause excessive bleeding so don't prescribe to self.
For now take a single dose and visit a gynaecologist. ...
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