Efil 5  mg Tablet it may increase risk of fainting. To avoid adverse reaction, consult your doctor if you are already taking other medicines. The dosage of Efil 5mg Tablet depends on many factors such as the user’s age, health, medical history of the patient and many other conditions. Please take this medicine as prescribed by your doctor. Efil 5 mg Tablet is a phosphodiesterase (PDE-5) inhibitor. It works in erectile dysfunction by increasing blood flow to penis by relaxing the muscles in penile blood vessels.