Drug name: Brand Viagra

Active substance: Sildenafil citrate

Pharmacological effects: Viagra is a well known preparation which works by inhibiting PDE-5 thus allowing the cGMP to accumulate and reach a normal erection. The drug does not cause an erection without sexual stimulation, nor does affect acuity of vision.

Indications: Viagra is prescribed to patients in treatment of erectile dysfunction. For the preparation to express any effect sexual stimulation is required.

Warnings and Precautions: The drugs should not be used in the following conditions:

• Hypersensitivity to any components of the preparations.
• Severe liver failure
• Hypotension
• Cardiovascular disease
• Cornea pigmentation
• Stroke

Side effects: Drugs may cause side-effects which in specific patients may manifest differently. In the following paragraph we want to underline the most serious and frequent side effect of Viagra that  were identified by the drug manufacturers. The possibility of the adverse effect manifestation depends only on the individual and his specific traits. Sildenafil citrate side effects include:

• Headache
• Flushing
• Dizziness
• Dyspepsia
• Nasal congestion
• Changes of vision

For full information on any risks and adverse effects associated with Viagra, please consult your doctor, read the included leaflet or contact our customer support service.

Interactions: Before using Sildenafil citrate please tell your doctor which drugs or supplements you are already taking including those bought without a prescription. Also check if any additional medicine which you will take during the course of Viagra therapy are safe in combination. Especially mention if you are taking the following groups of drugs:

• Nitrates
• Antibiotics
• Antimycotics
• Alcohol
• Anti hypertensive drugs