Men who are preparing for pregnancy can regulate the use of minoxidil tincture under the guidance of a doctor. The main ingredient of minoxidil tincture is minoxidil, which is a topical vasodilator that can stimulate local hair growth by improving local blood circulation, and is used for the treatment of male pattern baldness and patchy baldness. Adverse effects of the drug mainly include local burning sensation, flushing, itching, and rash, and there is no clear data on the effect on sperm count and sperm quality in men. Minoxidil tincture is contraindicated in people who are allergic to the ingredients of the drug, and should be used with caution in pregnant women, the elderly, and people with severe hepatic or renal insufficiency, but not in men who are preparing for pregnancy. It is important to note that this product is limited to topical use on the scalp and should not be taken orally or applied to other areas of the body. It is recommended that pregnant men use the drug under the guidance of a doctor and avoid self-medication.