Jingo is the trade name, generic name sildenafil citrate tablets, can usually be taken after meals, specific medication as prescribed by the doctor. Sildenafil citrate tablets are a common selective inhibitor of phosphodiesterase type 5, which has a certain therapeutic effect on erectile dysfunction. The drug does not specify the specific time of use, that is, before and after meals can be taken. Note that contraindications include hypersensitivity to any of the components of the product, any dosage form of nitrate regular or intermittent consumption, and prohibited and guanylate cyclase agonists (such as levocetirizine), and should not be used in patients with cardiovascular disease. Common adverse reactions after taking the drug include headache, nausea, dizziness, flushing, visual abnormalities, dyspepsia, nasal congestion, back pain, myalgia and so on. The use of specific drugs should be directed by a specialist.