MECHANISM

• Viagra does not sexually arouse a man. It only works if a man is sexually stimulated.
• When you get aroused sexually, the nervous system in your penis’s erectile tissue releases nitric oxide (NO).
• The nitric oxide stimulates an enzyme that produces something called a messenger cyclic guanosine monophosphate (cGMP).
• The cGMP relaxes the smooth muscle cells. One result of this is that the arteries in your penis dilate and the blood can flow into your penis more easily.
• Another result is that the erectile tissue itself fills with blood. Both of these process result in an erection.

DOSAGE

• The most commonly prescribed Viagra dosage is 100mg. If you are using Viagra for the first time, it is very likely that you will be prescribed this dosage.
• Take only one tablet by mouth.
• Take it one hour before planned sexual activity.
• Do not eat heavy meal before taking Viagra as its effectiveness will reduce.
• Do not consume consume alcohol along with Viagra.
• Take only one dose per day, do not double dosage.

PRECAUTIONS

Note to tell your doctor if you have ever had the following problems –

• Anatomical deformity of the penis, Peyronie’s disease, or ever had an erection that lasted more than 4 hours

• Bleeding disorder
• cancer
• Diabetes
• Frequent heartburn or gastroesophageal reflux disease (GERD)
• Heart disease, angina, high or low blood pressure, a history of heart attack, or other heart problems
• High cholesterol
• HIV infection
• Kidney disease
• Liver disease
• Sickle cell disease
• Stroke

SIDE EFFECTS

• Flushing
• headache
• Indigestion
• Nausea
• Stuffy nose

WARNING

Side effects that you should report to your prescriber or health care professional as soon as possible.

• back pain
• changes in hearing such as loss of hearing or ringing in ears
• changes in vision such as loss of vision, blurred vision, eyes being more sensitive to light, or trouble telling the difference between blue and green objects or objects having a blue color tinge to them
• chest pain or palpitations
• difficulty breathing, shortness of breath
• dizziness
• eyelid swelling
• muscle aches
• prolonged erection (lasting longer than 4 hours)
• skin rash, itching
• seizures