Viagra generally refers to sildenafil citrate tablets, and the symptom of flushing after taking it is generally an adverse reaction caused by the drug. Sildenafil citrate tablets are often used in the clinical treatment of erectile dysfunction, the drug has the effect of dilation of blood vessels, so after taking it may appear the phenomenon of flushing, usually can be improved on their own, no need for special treatment. However, if the redness persists, it is important to consult a doctor for examination. In addition to flushing, sildenafil citrate tablets may also have headache, indigestion, nasal congestion, blurred vision, diarrhea, vertigo and other adverse symptoms. It is also important to note that while taking Sildenafil Citrate Tablets Tablets, drugs such as nitrates and guanylate cyclase agonists (e.g., leucovorin) should not be taken in order to avoid a dangerous decrease in blood pressure. In addition, this drug is contraindicated for women, people who are allergic to the product, children, people whose recent cardiovascular state is not suitable for sexual intercourse. It is recommended to use the drug under the supervision of a doctor and to seek medical treatment in case of serious discomfort.