The side effects of Mafulon for regulating menstruation. Mafulon is a common drug that can be used to treat gynecological diseases, such as dysmenorrhea, irregular menstruation, etc. However, Mafulon also has some side effects, such as headache, nausea, breast tenderness, etc. This article will elaborate on the side effects of Mafulon from four aspects: pharmacological effects, drug indications, side effects and contraindications. Pharmacological effects: The main component of Mafulon is theophylline, which can reduce the contraction and expansion of uterine smooth muscle, thereby having an antispasmodic effect. In addition, Mafulon also has progesterone-like and estrogen-like activities, which can regulate the impact of estrogen on the endometrium, thus