It is usually possible to take sildenafil after drinking Red Bull. Red Bull is just a functional drink, which generally does not cause adverse reactions after drinking, in which case taking sildenafil will generally not be affected by it, and will not affect the efficacy of the drug. However, before taking sildenafil, remember, do not combine with alcohol, because after drinking alcohol will make the blood vessels in a dilated state, the central nervous system is more hyperactive, in this case taking sildenafil, easy to cause penile corpus cavernosum congestion, and will make the erection time prolonged, on the penis spongy function will cause some impact. Common adverse reactions to Sildenafil Citrate Tablets mainly include headache, flushing, dizziness, nasal congestion, indigestion, visual abnormalities. Rare adverse reactions mainly include facial edema, shock, fatigue, pain, rash, tachycardia, palpitations (rapid heartbeat, often accompanied by panic), low blood pressure, postural hypotension, and so on. Before taking the drug, you need to know that sildenafil is prohibited in combination with nitrate drugs, the drug is contraindicated in women, people who are allergic to the product, children, people whose recent cardiovascular state does not allow them to have sex. If you need to take sildenafil, you should follow the doctor’s instructions, avoid unauthorized use of the drug.