Sildenafil take 25mg and 50mg is mainly a difference in dosage, may both be effective, may both be ineffective, should be based on the patient’s condition after taking the drug, not a generalization. Sildenafil belongs to the medication for treating erectile dysfunction in men and can improve erectile function. The difference in efficacy between 25mg and 50mg should be based on the patient’s condition. It is recommended that 50mg be taken first, and then increased to 100mg if the effect is poor, and reduced to 25mg for the next dose if the effect is good but the adverse reaction is obvious. Adverse reactions commonly seen with this product include dyspepsia, flushing, headache, abnormal vision, back pain, nasal congestion, myalgia, nausea, and rash. It is contraindicated in people who are allergic to the product and those taking nitrates. It is recommended to consult a physician before using the drug to assess the condition before choosing the right dose.