Sildenafil Side-effects

Like any other medicines, Viagra may cause few side-effects in some of the patients. These side effects usually are usually not prolonged as they are mild in nature. Some of the most common side-effects of Viagra are:

Headache
Flushing of face
Upset stomach
Changes in color vision
Headache
Nasal congestion

Viagra Serious Side Effects

There are a few serious side effects reported with the use of Viagra. Patients experiencing any of the severe side effects must immediately report to the doctor. Some of the serious side-effects of the drug are:

Signs of allergy
Chest pain
Sudden decrease or hearing loss
Seizures
Changes in vision
If erection continues for four hours

Drug Interactions

Patients must be aware that certain medications are known to interact with Viagra. Thus, it is important for the patients to inform doctor about all the prescription, non-prescription, herbal or vitamin supplements they are taking before using Sildenafil. Following categories of drugs are known to interact with Viagra:

Alpha-blockers used for treating prostate problems or high blood pressure
Protease inhibitor
Antibiotics and antifungal medications
Cimetidine, a medicine recommended for treating ulcers
nitrates

Important Warning and Precautions

Patients taking Viagra should be aware of warnings and precautions associated with the drug to ensure safe administration of the drug. There are certain medical conditions in which patients need to consult the doctor before taking Sildenafil. Patients suffering from any of the given conditions need to consult doctor before taking Viagra:

Heart problems, especially in the past 6 months
High or low blood pressure
Kidney problems
Liver problems
Retinitis pigmentosa
Stomach ulcers
Deformed penis
Have ever had blood problems like sickle cell anemia or leukemia

Patients must avoid using Viagra if they are:

Allergic to any of its ingredient
Using medicines that contain nitrates
Taking any other erectile dysfunction drugs
Less than 18 years of age