Sildenafil should be Sildenafil Citrate, and there is no claim as to how often this product is good for your health, and it is taken up to once a day for the treatment of erectile dysfunction. Sildenafil Citrate is commonly available in tablet form for the treatment of erectile dysfunction. Sildenafil Citrate is to be administered under the supervision of a physician as required by the condition and is to be used up to once a day. If you increase the number of times you take it without authorization, it will increase the side effects of the drug. Adverse effects of Sildenafil Citrate are commonly associated with pain, chills, palpitations (rapid heartbeat, often accompanied by panic), dry mouth, vomiting, thirst, insomnia, drowsiness, anxiety, etc.; Contraindication is that the product should not be taken during the administration of nitrate drugs in any dosage form. Note that this product should be used with caution if there are anatomical deformities of the penis. Sildenafil citrate should be used under the guidance of a physician, do not take on your own to avoid adverse consequences.