Taking sildenafil usually does not have an uncontrolled erection, sildenafil has adverse reactions and contraindications, taking sildenafil should be guided by a doctor to use the drug. Sildenafil is indicated for the treatment of erectile dysfunction and can improve the symptoms of erectile difficulties. The drug requires sexual stimulation to take effect, so as long as the daily dose of sildenafil is reasonable, the abnormal situation of uncontrolled erection after taking sildenafil does not usually occur. Adverse reactions such as headache, indigestion, nasal congestion, back pain, nausea, dizziness, rash, angina, frequent urination, and abnormal ejaculation may occur after taking Sildenafil. The drug is contraindicated in newborns, children, women, patients taking any dosage form of nitrate, and patients who are allergic to any of the ingredients in the product. Taking sildenafil should be guided by a doctor, and if symptoms of uncontrolled erection occur after taking sildenafil, you should seek medical attention.