Viagra is the trade name and generic name for sildenafil, which can be taken before bathing, but try to avoid taking a hot bath after taking the drug. Sildenafil is a specific phosphodiesterase 5 inhibitor, clinically used mainly in men with erectile dysfunction. The drug can be taken before bathing, but try to avoid taking a hot bath after taking the drug, because hot water can cause skin capillary dilatation, coupled with the effect of sildenafil may lead to low blood pressure, dizziness, fainting and other symptoms. It should also be noted that sildenafil is forbidden to be combined with nitrate drugs, and the drug is contraindicated in women, people who are allergic to the product, children, and people whose recent cardiovascular status makes them unfit for sexual intercourse. Sildenafil is usually taken about 1 hour before sex and requires a certain amount of sexual stimulation to work. The use of the drug must be under the guidance of a specialist, strictly grasp the contraindications and monitor adverse reactions to avoid adverse consequences.