Viagra refers to sildenafil and hot baths are not recommended after taking it. Sildenafil improves the quality of male sexual life and is a drug used to treat erectile dysfunction in men. This drug can have side effects such as headache, facial flushing, abnormal vision, visual color change, blurred vision and even brief blindness. After taking the drug, blood circulation throughout the body is accelerated and blood vessels dilate. At this time, if you take a hot bath, it will aggravate the vasodilation and make these side effects more obvious, which is not conducive to the alleviation of these side effects. Therefore, taking a hot bath after taking sildenafil is not recommended. In addition, sildenafil is prohibited in combination with nitrate drugs, this drug is contraindicated in women, people who are allergic to this product, children, people whose recent cardiovascular state does not allow them to have sex. The use of this drug is subject to medical advice to avoid adverse reactions.