Viagra generally refers to Sildenafil Citrate, after taking Sildenafil Citrate, face fever is an adverse drug reaction, which is caused by dilation of blood vessels, and this adverse reaction usually disappears after some time.
Sildenafil citrate is mainly used for the treatment of erectile dysfunction in men, and its use may lead to adverse reactions such as blushing, face fever, headache and nausea. Usually this adverse reaction goes away after about 4 hours of taking the medication.
Sildenafil should not be combined with nitrate medications (e.g., nitroglycerin, isosorbide mononitrate); it significantly lowers blood pressure. The drug is contraindicated in women, people who are allergic to the product, children, people whose recent cardiovascular state does not allow them to have sex. The drug is prescribed and should be used in strict compliance with medical advice.