Viagra (Sildenafil)
Sildenafil, commonly known by its brand name Viagra, is a medication used primarily to treat erectile dysfunction (ED) in men and occasionally for pulmonary arterial hypertension (PAH). It is available in tablet form and should be taken orally.
Dosage and Administration
For erectile dysfunction, Sildenafil is typically taken as needed, about 30 minutes to 1 hour before sexual activity.
The recommended starting dose is 50 mg, but it can be adjusted based on effectiveness and tolerance.
The maximum recommended dose is 100 mg, and it should not be taken more than once a day.
For pulmonary arterial hypertension, the dosing regimen varies and should be strictly followed as prescribed by a healthcare provider.
How it works
Sildenafil works by inhibiting an enzyme called phosphodiesterase type 5 (PDE5). This inhibition leads to increased levels of cyclic guanosine monophosphate (cGMP), resulting in smooth muscle relaxation and enhanced blood flow to specific areas of the body, such as the penis.
Side Effects
Common side effects include headaches, flushing, upset stomach, and dizziness. In rare cases, it can cause more serious side effects like sudden vision loss or an erection lasting more than 4 hours, which requires immediate medical attention.
Patients with heart conditions, those taking nitrates or blood pressure medications, should use caution and consult a healthcare professional before taking Sildenafil.
Interactions with Other Medications
Sildenafil can interact with nitrates used for chest pain, causing a significant drop in blood pressure. It also interacts with certain antifungal medications, HIV protease inhibitors, and other ED medications.
Storage and Handling
Store at room temperature away from moisture and heat.
Keep out of reach of children and pets.
Do not use past the expiration date.
Price Comparison
In Canada, Sildenafil is often available at a lower price compared to other countries. For example, the cost per pill can be significantly cheaper in Canadian pharmacies.
Online Purchasing
When buying Sildenafil online, especially from Canadian sources, it's essential to use reputable pharmacies.
Sildenafil is typically taken as needed, about 30 minutes to 1 hour before sexual activity. The recommended starting dose is 50 mg, but it can be adjusted based on effectiveness and tolerance. The maximum recommended dose is 100 mg, and it should not be taken more than once a day.
