Viagra leads to muscle relaxation and increases blood flow to certain body parts. this medicine is used to treat erectile dysfunction in men. This is the inability to achieve and maintain an erection for sexual activity that is satisfactory. This condition leads to impotence.

Dosage and administration.

Viagra is available in denominations of 25, 50 and 100 mg tablets. They prescribed to be administered orally.

· The recommended dosage for most patients is 50mg tablet to be taken an hour before sexual activity. It can be taken between thirty minutes to four hours before engaging in sexual activity. The dosage also can be increased to 100mg daily or reduced to 20mg tablets on daily basis depending on the ability to tolerate and effects on different patients. Note that the tablets should not be taken more than once in a day.

· For persons with 65 years and above, those with liver failure or creatinine clearance should start with the 25mg tablet.

· Individuals under ritonavir should not take more than 25mg of the medication in a period of 48hours that is two days.

· Ensure to take Viagra as prescribed by the doctor, not a dosage more or less.

· Viagra should be stored at room temperature away from heat and moisture.

Contraindications.

· Intake of nitrates. Use of Viagra may increase hypotensive effects of nitrates.

· Can also bring about hypersensitivity to tadalafil.

· Viagra intake may lead to prolonged erections. That is erections will go on even after sexual activity.

· Viagra use can also lead to sudden vision loss, a condition known as NAION.

· Cases of sudden hearing loss have also been witnessed.

· Patients with ulcer issues experience bleeding after use of Viagra.

· Do not take Viagra if you are using any other PDE5 inhibitors.

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Warnings.

· Never use Viagra if you are allergic to sildenafil.

· You are not supposed to take Viagra if you are using any medicine containing a nitrate for chest pains. Nitrates together with Viagra can result into a sudden fall in blood pressure.

· In case your erection is painful or goes for more than four hour contact a doctor immediately. Prolonged erections can damage the penis.

· If sudden vision loss is experienced stop sexual activity and use of these product and see a doctor with no delay.

· If during intercourse you experience numbness, dizziness, or pain in your neck, chest, lower jaw or arms, stop the act immediately and call your doctor.it could be a serious side effect of Viagra.

· Avoid the use of grape fruit if under Viagra or if you want to take, they react to bring unwanted side effects.

· Individuals with angina should not take Viagra as sexual activity can precipitate angina.

Precautions.

Open up to your doctor in Australia about your health conditions to ensure that Viagra is safe you, especially if suffering from the diseases listed below.

· Heart disease or heart beating complications.

· High or low blood pressure

· Liver and kidney diseases.

· Stomach ulcers

· Bleeding problems

· A physical deformity of the penis

· If you have been restricted from engaging in sexual activity due to health problems.

· Eye problems.