Avanafil is a modern equivalent for Viagra.

Avanafil belongs to the group of "phosphodiesterase inhibitors-5" - Avanafil. The main advantage is a fast perception (less than 15 minutes), and minimal side effects. Avanafil tablets contain the active ingredient Avanafil, which is a medicine used in the treatment of erectile dysfunction (impotence). Avanafil is called a phosphodiesterase type 5 inhibitor, and works by preventing the action of a chemical in the body called phosphodiesterase type 5.

As Avanafil enhances the actions of the chemical messengers responsible for producing an erection, it will only work once these messengers are present. This means that sexual stimulation is required for it to produce and maintain an erection. The dose should be taken approximately 30 minutes before you intend to have sex. Sexual stimulation is needed for a reaction to medicine.

What is it used for?
Avanafil is used to treat erectile dysfunction (impotence).

How do I take it?
Avanafil should be taken about 30 minutes before sexual activity. With sexual stimulation you may achieve an erection after about 20 to 40 minutes.
The usual recommended dose of Spedra is 100mg. If this is not effective enough your doctor may increase your dose to a maximum of 200mg, but this should only be done if you have not experienced any side effects with the lower dose. The dosage can also be reduced by 50mg if you are experiencing side effects or if you are taking certain other medicines. It should preferably be taken on an empty stomach. If it is taken with food it may take longer to start working.
The tablet should be swallowed whole with a drink of water.
You should avoid drinking grapefruit juice in the 24 hours before taking this medicine, as it may increase the level of this medicine in your blood and so could increase the risk of side effects.
Do not take Avanafil more than once a day.

Side effects
Medicines and their possible side effects can affect individual people in different ways. The following are some of the side effects that are known to be associated with this medicine. Just because a side effect is stated here does not mean that all people using this medicine will experience that or any side effect.

Common (affect between 1 in 10 and 1 in 100 people): Headache, Flushing, Nasal congestion.

Uncommon (affect between 1 in 100 and 1 in 1000 people): Dizziness; Sleepiness or fatigue; Sinus congestion and headache; Blurred vision; Hot flushes; Difficulty breathing after exertion; Awareness of your heart beat (palpitations); Increased heart rate (tachycardia), Abnormal heart rhythm; Feeling sick or vomiting; Indigestion; Back pain; Muscle tightness; Raised liver enzymes.

Use with caution in:
    Men over 70 years old.
    Men with mild to moderately decreased liver function.
    Men with diseases involving the heart and blood vessels (cardiovascular disease).
    Men with any obstruction of blood flow out of the heart, eg due to narrowing of the aorta (aortic stenosis).
    Men with bleeding disorders, eg haemophilia.
    Men with an active peptic ulcer.
    Men with conditions such as sickle cell disease, bone cancer or leukaemia in which there is an increased risk of prolonged erections (priapism).
    Men with a physical abnormality of the penis, such as severe curvature, scarring or Peyronie's disease.

Storage:

Store Avanafil at 77 degrees F (25 degrees C). Keep away from heat, moisture, and light. Do not store in the bathroom. Keep the pills out of the reach of children and away from pets.