How does sildenafil work?
During sexual arousal the blood flow to the penis changes. This change in blood flow produces erections. Sildenafil is known medically as a pde5 inhibitor. PDE5 inhibitors alter the levels of natural chemical messengers involved in the production of erections.
Why choose sildenafil?
Sildenafil is a proven drug. Most men consider it an effective treatment and are usually not bothered by significant side effects. It usually starts to work within 30 minutes of taking a tablet and usually remains active for about 4 hours. Erections will take place only during this period if there is stimulation. If there is no stimulation, there will be no erection. After 4 hours the effects of the tablet wear off.
Alternative tablets include Cialis (tadalafil), Levitra (vardenafil) and Spedra (avanafil). They work the same way, but for different time intervals. See the differences on the tablet for more details.
How to take sildenafil
The normal initial dose, in men who have not taken sildenafil before, is one 50 mg tablet. Subsequent doses can be adjusted up to 100mg as a single dose, or up to 25mg, depending on the response. Most men find a sufficient amount of 50mg. Sildenafil should not be taken more than once in 24 hours.
The results of treatment may not be exactly the same every time. It is best to take the same dose that worked previously, increasing the dose only if in several cases the treatment is not successful.
Contraindications and interactions
All men with erectile dysfunction should consult a doctor face to face before buying sildenafil tablets online. Sildenafil is not suitable for all men, particularly men who have severe heart disease or a history of stroke. Some prescription drugs interact with sildenafil, mainly drugs called nitrates, used to treat angina and heart disease.
Men should not take Sildenafil without further evaluation by their doctor when the following apply:
- Low or high blood pressure
- Allergies or reactions to previous ED treatments
- Recent heart attack (within 6 weeks) or you suffer from angina (heart pain while exercising) or any
- form of heart disease
- History of strokes or mini-strokes (transient ischemic attack)
- History of vision problems caused by traffic problems
- History in the family of rare degenerative eye diseases
- Severe renal (renal) or liver disease
- Peyronie’s disease – angulation or deformation of the penis
- Leukemia, multiple myeloma or sickle cell disease
- Bleeding disorders (such as haemophilia)
- Current active stomach ulcers (peptic ulcer or gastric ulcer)
Side effects of sildenafil
Most men find sildenafil effective and show no significant side effects.
The most common side effects affecting up to 1 in 10 men are nausea, flushing to the face, hot flushes (symptoms include a sudden sensation of heat in the upper body), indigestion, color deviation in vision, blurred vision, visual disturbance, stuffy nose and dizziness.
A complete list of side effects can be found in the manufacturer’s patient information booklet.
Allergic type reactions, chest pains or spasms, which are very rare, require immediate medical attention. Prolonged (2 hours or more) painful erections, a medical condition called priapism, may occur and requires immediate medical attention.
For more information see the side effects of Viagra / sildenafil.