Cenforce 100 mg can work differently from person to person because the response to sildenafil varies considerably. Common reasons include: Underlying cause of erectile dysfunction: diabetes, cardiovascular disease, nerve problems, hormonal issues, and psychological factors can affect the response. Timing and food: sildenafil is generally taken about 1 hour before sexual activity. A high-fat meal can delay its absorption and make the effect seem slower. Other medicines: some drugs can increase or decrease sildenafil levels or affect blood pressure. Age, liver and kidney function: these can change how long sildenafil stays in the body. Cenforce 100 mg stimulation: sildenafil doesn't automatically cause an erection; sexual stimulation is still required. Dose tolerance and side effects: 100 mg isn't necessarily better for everyone. Official prescribing information lists 50 mg as the usual starting dose, with adjustment between 25–100 mg according to effectiveness and tolerability, and no more than once daily. Also, Cenforce is a brand/product name, so the reliability of the actual tablet depends on where it was obtained. If you tell me what happens when you take 100 mg (e.g., works too slowly, doesn't work, works briefly, or causes side effects), I can explain the likely reason.