Impedance and erectile dysfunction are two conditions for which Cenforce 100 dosage is prescribed. An ingredient in this medication called sildenafil aids in boosting blood flow to men's penile tissues. This medication can be taken either before or after a meal. When taking this medication, avoid fatty foods and alcoholic beverages. Take this medication 45 minutes prior to sexual activity. Consume this medication with water; do not crush or chew the tablet. This medication has a 4 to 5-hour half-life. Only men who are at least 18 years old should take this medication. Follow your doctor's advice when taking this medication.