Tretinoin injection can not be injected twice in a week in principle. The main ingredient of Triamcinolone acetonide is Triamcinolone acetonide derivative of Triamcinolone A. Triamcinolone acetonide is a kind of medium-acting glucocorticoid with strong and long-lasting anti-inflammatory and anti-allergic effects, which is not needed to be used continuously within a short period of time so as not to increase the adverse reactions of the drug. After intramuscular or intradermal injection, Tretinoin Injection is absorbed slowly and can take effect within a few hours, and the effect can be maintained for about 2~3 weeks, so there is no need to repeat the injection within a week. Tretinoin Injection is absorbed just as slowly when injected through the joint cavity and can last for about 1 to 2 weeks, so there is no need to repeat the administration either. Adverse reactions such as edema, hirsutism, skin atrophy, and induction of infections may occur with prolonged overdose of Tretinoin Injection. It needs to be contraindicated in patients with viral infectious diseases, spontaneous platelet deficiency purpura, and those with active gastric ulcers. In order to ensure the safety of the medication, it is important to follow the doctor’s instructions strictly when choosing Trimethoprim for treatment.