Written by Dr. Ayman El Zein, MD
Medically reviewed by Dr. Amirreza Elahian
Last Updated on January 12, 2026
What is Viagra?
Viagra is used to treat erectile dysfunction by helping increase blood flow to the penis during sexual stimulation. The active ingredient, sildenafil, works by relaxing blood vessels, making it easier to get and keep an erection. Generic versions contain the same sildenafil and are made to meet the same medical standards as the brand-name medicine.
Generic sildenafil is available in 25 mg, 50 mg, and 100 mg doses, giving flexibility in how it is used. Many people begin with the 50 mg dose, while some may use a lower or higher dose depending on their response and tolerance. It has been prescribed for many years and is one of the most commonly used treatments for erectile dysfunction.
Can I Buy Generic Viagra (Sildenafil) Online?
Yes. Accessing generic sildenafil online through a Canadian pharmacy is possible and has become a common option for many people. Reviewing product details, dosage options, and usage information before ordering allows users to make informed choices without pressure or discomfort. This method fits well into daily life and avoids the challenges of visiting a physical pharmacy.
A Canada-based pharmacy offers both brand-name and generic sildenafil that meets established safety and quality requirements. Commonly available strengths include 25 mg, 50 mg, and 100 mg, giving flexibility in treatment selection. Generic options contain the same active ingredient and allow customers to save up to 30%, while discreet packaging and a simple ordering process add to overall convenience.
FAQ
Can Viagra work in 20 minutes?
Yes, it can work in about 20 minutes for some people, but that’s not guaranteed. Onset time varies by individual and is often faster on an empty stomach, while a heavy or fatty meal can delay the effect. Sexual arousal is still required for it to work. For many people, the full effect is more reliable after 30-60 minutes.
When is the best time to take the pill?
The best time is usually 30-60 minutes before sexual activity. Taking it on an empty stomach or after a light meal helps it work faster and more reliably. Avoid heavy or high-fat meals beforehand, as they can delay the effect. It’s not meant to be taken right before or after alcohol-heavy drinking.
Who should not take it?
Contraindications include:
- Use of nitrate medicines for chest pain or heart problems
- Severe heart disease or a recent heart attack or stroke
- Very low blood pressure or uncontrolled high blood pressure
- Medical advice to avoid sexual activity
People with serious liver, kidney, or certain eye conditions should consult a healthcare professional before use.
Are there negatives to sildenafil?
Yes, most of the negatives relate to side effects because this medication is generally safe and effective when used properly. The main concerns are unwanted physical reactions, possible interactions with other medicines, and safety issues in people with certain health conditions. It also has practical limitations, such as needing sexual stimulation and planning ahead rather than working instantly.
Should a 70 year old man take this tablet?
Yes, a 70-year-old man can take it, but only if it’s medically appropriate for him. Age alone isn’t a problem – the key factors are overall heart health, blood pressure, and other medications being used. Older adults often start with a lower dose to reduce side effects. A healthcare professional should review his medical history before use.
What are the side effects?
Based on updated clinical and post-marketing statistics, the most common side effects of Viagra include:
- Headache (≈ 15-16%)
- Flushing or facial redness (≈ 10%)
- Indigestion or stomach discomfort (≈ 7%)
- Nasal congestion or runny nose (≈ 4%)
- Dizziness or lightheadedness (≈ 2%)
- Temporary vision changes such as blurred vision or color tint (≈ 2%)
Most side effects are mild, short-term, and resolve on their own. Seek medical help if side effects are severe, persistent, or include chest pain or a prolonged erection.
Does it keep you hard after coming?
No. It does not keep an erection after ejaculation – once you climax, the erection typically goes away as part of the normal sexual response. The medication helps with getting and maintaining an erection before orgasm, not preventing the body’s natural recovery phase afterward. Some men may be able to get another erection sooner than usual, but it won’t keep you hard after coming.
How long does blue take to kick in?
The blue pill usually starts to work within 20-30 minutes, though for some people it may take up to 60 minutes. It works faster when taken on an empty stomach, while heavy or fatty meals can delay the effect. Sexual stimulation is still required for it to work. Once active, the effects can last for several hours.
Can I take sildenafil one time for fun?
Yes, some people take it occasionally without having erection problems, but it’s not recommended just “for fun”. If there’s no underlying issue, the benefit is often limited while side effects like headache, flushing, dizziness, or low blood pressure can still occur. It can also be unsafe for people with heart conditions or those taking certain medications. It’s best used when there’s a real need and medical guidance.
What is a 50 mg tablet price at a Canadian pharmacy?
A 50 mg tablet price (generic version of Viagra) varies by quantity, but roughly for a 10-pill pack it’s about $30–$32 at a Canadian pharmacy. That works out to around $3 per pill on average – prices usually get lower per tablet in larger packs. Exact cost depends on the pharmacy or online supplier you use.
What should you tell your doctor before taking the tablet?
Before taking the tablet, tell your doctor if you:
- Have any heart problems, chest pain, or a history of heart attack or stroke
- Have high or low blood pressure
- Take nitrates, alpha-blockers, or other prescription medicines
- Have liver, kidney, or serious eye conditions
- Have ever had a prolonged or painful erection
Sharing this information helps ensure the medication is safe and appropriate for you.
What is the right dosage for me?
The right dosage of sildenafil depends on your age, overall health, and how you respond to it.
- 25 mg is often the starting dose, especially for older adults or those sensitive to side effects
- 50 mg is a common standard dose if needed
- 100 mg may be used if lower doses are not effective and are well tolerated
Only one dose should be taken per day, and a healthcare professional should guide dose adjustments.
Can I take Viagra with other medications?
Yes, the ED pill can be taken with some medications, but caution is important. Drugs like tamsulosin and amlodipine may be used together only under medical guidance, as the combination can increase the risk of low blood pressure or dizziness. Prednisolone generally does not have a direct interaction, but your overall health still matters. Always tell your doctor about all medications you take so potential interactions can be safely managed.
Can this tablet cause swollen ankles?
Yes, it can cause swollen ankles, but this side effect is uncommon. Updated safety data show that fluid retention or leg swelling is reported in a small percentage of users, usually mild and temporary. It’s more likely in people with heart, kidney, or circulation issues or those taking other medications that cause swelling. Persistent or worsening swelling should be checked by a doctor.
About the Author
Dr. Ayman El Zein, MD, is a senior internal medicine consultant with extensive experience in clinical practice and medical research. He earned his medical degree from Victor Babeș University of Medicine in Timișoara and has worked internationally, including in Kuwait and Canada. His time at the Ottawa Heart Institute as a physician and postdoctoral research fellow reflects a practical, patient-focused approach grounded in evidence-based medicine and the care of complex cases.
Disclaimer: The content provided is intended for general informational use only and is not a substitute for professional medical advice. Please consult a licensed healthcare professional regarding any medical questions or conditions.