Is it impermissible for a woman to take medication or herbs to induce menstruation if it is delayed or irregular, and what are the cases in which this is permissible?

It is permissible for a woman to take medication to induce menstruation if it is for a legitimate purpose and the medication is permissible. It is forbidden if it is for an illegitimate purpose, such as abandoning prayer or breaking the fast in Ramadan. It is permissible to take medication to regulate the menstrual cycle. It does not matter whether the medication is herbs or other substances; what is important is that it does not harm the woman and that its use is Islamically permissible.