The generic name of Viagra is sildenafil citrate tablets, and after using the drug, you may have the symptoms of body fever and fast heartbeat. The symptoms of fever and rapid heartbeat after taking Sildenafil citrate tablets may be due to the dilation of blood vessels in the whole body, accelerated blood circulation and over-excitement of the central nervous system after taking the drug, and the symptoms will be gradually reduced after stopping the drug in time. Sildenafil citrate tablets should be taken to know, allergic to the drug ingredients are prohibited, in pregnancy, lactation should be prohibited, if the use of the drug after the occurrence of dizziness, headache, skin flushing, dyspepsia and other symptoms, need to be regularly observed, serious cases should be promptly discontinued to seek medical attention. Sildenafil citrate tablets should be taken in accordance with medical advice, to avoid unauthorized use of drugs to aggravate adverse reactions.