Taking 100 mg of sildenafil Cenforce 100mg may be safe for some adults when it is prescribed by a qualified healthcare professional. It is often considered the maximum recommended starting dose and should not be taken more than once in 24 hours. Safety depends on individual health conditions, age, and other medicines being used. People with heart problems, low blood pressure, or those taking nitrate medicines should avoid it unless advised by a doctor. Common side effects may include headache, dizziness, flushing, or stomach discomfort. Consult a healthcare provider before use to ensure safe and appropriate dosing for your condition.