Viagra is a sildenafil citrate based drug belonging to phosphodiesterase type 5 (PDE5) inhibitors class, that is used to treat erectile dysfunction in men. VIAGRA has been a US FDA-approved medication since 1998.

Sildenafil citrate acts by catalyzing PDE5 enzyme, which allows cyclic guanosine monophosephate (cGMP) to act, and improving blood supply to penis.

Viagra 25mg

Viagra 25mg is a blue-colored rhomboid-shaped film-coated tablet, indicated for oral use, taken without meals, as prescribed by a health care provider.

Viagra 25 mg comes in 4-pill blister packs. Each tablet is imprinted with VGR25 on one side and PFIZER on the other.

Viagra (Pfizer Inc) is a fast-acting medication. Its effect can initially become apparent 30 minutes after ingestion. Taking VIAGRA after consumption of fat-rich food can delay efficacy. Use of Viagra with alcohol is discouraged.

Contraindications and Precautions

See full list of VIAGRA contraindications, warnings and precautions.

Since geriatric male patients tend to have slower metabolism and excretion rate due to impaired hepatic and renal functions, 25 mg is the initial dose prescribed to patients who are at least 65 years old.

This is to ensure clearance and excretion of sildenafil citrate from patients' plasma. Taking more than one pill a day can be dangerous.

Studies have shown that concomitant use of erythromycin (antibiotic) can consequently alter Viagra efficacy.

Patients, prescribed to protease inhibitors, such as drugs used for HIV maintenance are typically prescribed to low dose Viagra.

Patients who have or have ever had the history of cardiopulmonary diseases are typically allowed to take VIAGRA of 25 mg dosage under close physician monitoring.

VIAGRA is taken with a minimum 24 hour period.

Absolute contraindication to Viagra, regardless of dose, is the use of nitrates.

Common side effects associated with the use of Viagra include nausea, vomiting, dry mouth, slight decrease in systolic and diastolic pressure, and flushing. Full list of side effects

Since 25 mg is the lowest dose, fewer side effects can be expected.

Different patients react differently to each drug. Contact your doctor immediately if side effects persist.

Additional Information on VIAGRA 25 mg

Please look through the resources, provided below, for more in-depth infomation about 25mg sildenafil citrate.

• VIAGRA - Frequently Asked Questions
• Prescribing information: http://www.pfizer.com/files/products/uspi_viagra.pdf
• U.S. Department of Health and Human Services: http://www.nlm.nih.gov/medlineplus/druginfo/meds/a699015.html
• Impotence Quiz. Test yourself: http://www.rxlist.com/quiz_impotence_erectile_dysfunction/quiz.htm