Viagra is the trade name, generic name of sildenafil citrate, the drug effect generally lasts for 4 hours, the adverse effects will be gradually weakened in about 2 hours.
After taking sildenafil citrate tablets, the general effect of the drug can last up to 4 hours, the adverse effects will be significantly weakened in 2 hours, but the specific how long to disappear should be combined with the individual situation as well as the absorption of the drug, and can not be standardized.
Sildenafil may affect the heart, after taking the drug, some patients will experience panic, palpitations, shortness of breath and other symptoms; some patients may have skin reactions after using the drug, manifested as skin flushing, itching and so on.
Take sildenafil citrate to know, allergy to drug components is prohibited, pregnancy, lactation, childhood, neonatal period is prohibited. Long-term use of the drug may cause nasal congestion and back pain in addition to the above reactions, but these symptoms are uncommon and can usually be relieved on their own after stopping the drug.
If you need to take sildenafil citrate, you should follow the doctor’s instructions to avoid unauthorized use of the drug to cause discomfort.