Irregular periods after marriage kindly suggest medicine?

Depends on the goal: If you just want to regulate your periods, birth control is a good option. If you want to become pregnant now and regulate your periods, Clomid (clomiphene) is usually the first line. Either requires the supervision of a qualified physician, so make sure you see a gyn or fertility doctor.

Hormonal birth ctrl: Irregular periods are caused when your body's signals for ovulation and menstruation get confused by hormonal imbalances that can be related to your thyroid (TSH), pituitary (LH/FSH/prolactin), ovaries (estrogen/progesterone). Many external factors can affect the hormones: malnutrition, stress, obesity, for example. Hormonal contraception can help to regulate your periods, which is healthier.