Sildenafil 25 mg is the lowest available dose and can be effective for men with mild erectile dysfunction (ED) or those who are sensitive to higher doses. It works by improving blood flow to the penile region, helping achieve and maintain an erection when sexually stimulated. This dosage is ideal for first-time users, older individuals, or those with certain medical conditions requiring a lower dose. However, if 25 mg does not provide the desired results, a doctor may recommend increasing the dosage. Always consult a healthcare professional to determine the right strength based on your needs and health condition.