Some people use delay drugs is possible side effects, different delay drugs side effects are different, delay drugs including dapoxetine hydrochloride, lidocaine gel, etc. Dapoxetine hydrochloride can cause headache, dizziness and other side effects, lidocaine gel can cause redness and swelling of the glans, itching and other side effects. 1. Dapoxetine hydrochloride: the use of dapoxetine hydrochloride can cause headache, dizziness, nausea, diarrhea and other adverse reactions. The drug is contraindicated in people with a known allergy to the product, in patients with a significant pathological condition of the heart, in patients with moderate and severe liver damage. The drug should also not be used in conjunction with thioridazine, strong cytochrome P450 3A4 inhibitors, monoamine oxidase inhibitors. 2. Lidocaine gel: this product is a local anesthetic, can reduce the sensitivity of the glans to achieve the effect of delay, occasionally allergic reactions, manifested as glans redness, swelling, itching, etc., allergic to lidocaine is prohibited. Delay drug to some people is to produce side effects, patients do not self-medication, to be in the physician interview under the guidance of standardized medication, to avoid adverse results.