Take 1 capsule as needed. Do not exceed 2 capsules per day. If you are on medication, wait 6 hours after taking your medication before using On Demand. Capsule will begin to work within 30-60 minutes. The effects can last up to 24 hours. On Demand can be taken with or without food. However, if you take it after eating high-fat meal, it may take a little longer to start working. You must be sexually stimulated for On Demand to work effectively.