Viagra, generally referred to as sildenafil citrate, is taken differently for different groups of people, with some people being able to take it 4 to 8 times a month. If you suffer from erectile dysfunction you can take sildenafil citrate under medical supervision to improve it, but it is recommended that you do not take it in high doses for a long period of time, as this may increase the incidence of adverse reactions such as facial flushing, dizziness, nausea and vomiting. Generally, for some people, it can be taken about 4 to 8 times a month. However, before using the drug, you need to pay attention to the fact that sildenafil is forbidden to be combined with nitrate drugs, and the drug is contraindicated for women, people who are allergic to the product, children, and people who should not have sex in recent cardiovascular states. Patients taking sildenafil citrate tablets should consult a doctor before using the drug, and take it under his guidance, do not take it blindly on your own.