Viagra usually refers to sildenafil citrate tablets. There are side effects to taking it 2 times a day, mainly in that it raises the probability of low or normal dose side effects. The main ingredient in Sildenafil Citrate tablets is Sildenafil Citrate, and the maximum recommended dose is usually taken up to once a day. The occurrence of side effects varies depending on the condition of the patient’s body, and taking two or more doses increases the probability of adverse drug reactions. The main side effects of sildenafil citrate tablets are headache, myalgia, nausea, and dizziness. Occasionally, edema, hypertonia, neuralgia, and dyspnea are seen, so overdose is not recommended. In addition, this product can enhance the antihypertensive effect of nitrate, so it is prohibited for patients who are taking any dosage of nitrate, either regular or intermittent, and for those who are allergic to any of the ingredients of sildenafil citrate tablets. The drug should be used under the guidance of a doctor, do not blindly use the drug on your own.