Viagra — The original ED medication by Pfizer, helps achieve full erection when aroused.
💊 Active Ingredient: Sildenafil Citrate
⏱️ How to Take: 1 tablet 30-60 minutes before sexual activity
🍽️ Can be taken with or without food (avoid high-fat meals for faster effect)
📦 Package: 1 blister per box (4 tablets per blister)
⚡ Key Benefit: Original by Pfizer, lasts 4-6 hours, global gold standard
🌡️ Storage: Room temperature, protect from light and moisture
Shipping
Discreet shipping within Thailand — packaging does not identify the product. Customers can review shipping and return conditions per our store policy. Contact our team for any questions.
Product Description
Erectile dysfunction medication is a medically proven option for men experiencing difficulty achieving or maintaining an erection (Erectile Dysfunction: ED). Viagra is an ED treatment in the PDE-5 Inhibitor class containing Sildenafil Citrate, available in 25 mg, 50 mg, and 100 mg strengths. It is the most recognised ED brand worldwide.
📊 Key Statistics
ED affects over 40% of Thai men aged 40 and above, increasing with age
Viagra was the first PDE-5 Inhibitor approved by the FDA in 1998
Sildenafil is effective in treating ED in up to 80% of users
🏭 Viagra is manufactured by Pfizer as the originator brand, FDA approved since 1998. It is the most recognised ED medication brand in the world.
⚠️ PDE-5 Inhibitors must never be used with Nitrate medications, as this combination can cause dangerously low blood pressure that may be life-threatening.
Medically reviewed by
Supatcheree A., Pharmacist | Sources: NHS, StatPearls, Drugs.com
Last reviewed: 2026-02-17
About Viagra
What is Viagra?
Viagra is an erectile dysfunction medication containing Sildenafil Citrate as its active ingredient. It belongs to the PDE-5 Inhibitor (Phosphodiesterase Type 5 Inhibitor) drug class and is manufactured by Pfizer as the originator brand, FDA approved since 1998.
Sildenafil works by inhibiting the PDE-5 enzyme, which breaks down cGMP in penile tissue. When PDE-5 is inhibited, cGMP levels increase, causing smooth muscle relaxation in blood vessels and increased blood flow to the penis, enabling an erection when sexually stimulated.
Important: Viagra does not cause an automatic erection — sexual stimulation is required.
What is Viagra used for?
Erectile Dysfunction (ED): Viagra treats the inability to achieve or maintain an erection sufficient for sexual intercourse.
ED may be caused by:
Vascular diseases (diabetes, hypertension, high cholesterol)
Other factors such as smoking, alcohol consumption
Not for: Enlarging the penis or as an aphrodisiac.
How to Take Viagra / Dosage
Starting dose: Take Sildenafil 50 mg approximately 30–60 minutes before sexual activity.
Dose adjustment: Your doctor may adjust to 25 mg or 100 mg based on response and side effects. Maximum dose is 100 mg per day.
Limit: Do not take more than once per day.
Duration of action: The medication works for approximately 4–6 hours after taking.
Tips:
Taking on an empty stomach works better — high-fat meals may delay the onset of action
Avoid excessive alcohol consumption as it may reduce effectiveness and increase side effects
Do not take with grapefruit juice
Side Effects of Viagra
Common side effects:
Headache
Facial flushing
Nasal congestion
Blurred vision / blue-tinted vision
Indigestion
Rare but serious side effects:
Priapism — erection lasting more than 4 hours (seek emergency help immediately)
Sudden vision loss (NAION)
Sudden hearing loss
Severe drop in blood pressure
When to seek immediate medical help:
Erection lasting more than 4 hours
Sudden vision loss
Chest pain or tightness
Contraindications & Precautions
Do not use:
Anyone taking Nitrate medications (e.g., Nitroglycerin, Isosorbide) — may cause life-threatening blood pressure drop
Severe heart disease or heart failure where sexual activity is unsafe
Low blood pressure (< 90/50 mmHg)
History of stroke or heart attack within the past 6 months
Allergy to Sildenafil or any component of the medication
Use with caution:
Kidney or liver problems — dose reduction may be needed
Eye conditions, especially retinitis pigmentosa
Alpha-blocker use — risk of blood pressure drop
Do not use with riociguat
How Does Viagra Compare to Other ED Medications?
Viagra vs. Sidegra: Same active ingredient — Sildenafil. Viagra is the originator by Pfizer at a premium price. Sidegra is a Thai generic at a much more affordable cost. Equivalent efficacy.
Viagra vs. Kamagra Oral Jelly: Same active ingredient — Sildenafil 100 mg. Kamagra Oral Jelly is in gel form for faster absorption, working within 15–20 minutes. Ideal for those who dislike swallowing tablets.
Viagra vs. Cialis (Tadalafil): Same mechanism (PDE-5 Inhibitor) but Cialis lasts up to 36 hours compared to Viagra's 4–6 hours. Cialis offers more flexibility in timing.
How Long Does Viagra Last?
Viagra begins working within 30–60 minutes and lasts for approximately 4–6 hours.
Factors affecting onset and duration:
Empty stomach: Faster onset (as quick as 20 minutes)
After a fatty meal: Delayed onset, potentially 1–2 hours
Age: Older adults may experience slower onset and longer duration
Alcohol: Reduces effectiveness
Important: Duration of action does not mean a continuous erection — sexual stimulation is still required for an erection to occur.
Where Can I Buy Viagra?
Viagra is a pharmacist-dispensed medication. You can order online from Intimo Life.
Can I buy Viagra online?
Yes. Order through Intimo Life — select the product, consult with a licensed pharmacist online, and receive your medication at home.
Do I need a prescription?
A doctor's prescription is not required, but the medication must be dispensed by a licensed pharmacist. At Intimo Life, our pharmacist will review your symptoms and health history to confirm suitability before shipping.
How does Intimo Life ship orders?
We deliver nationwide in Thailand with discreet packaging — no product names on the outside.
⚠️ Disclaimer
The information on this page is for general informational purposes only and is not intended to replace professional medical advice, diagnosis, or treatment from a qualified doctor or pharmacist. If you have any questions about your symptoms or medication, always consult a doctor or pharmacist first.
Both contain the same active ingredient — Sildenafil. Viagra is the originator brand by Pfizer at a premium price. Sidegra is a Thai generic at a much more affordable cost. Both have equivalent efficacy.
Viagra starts working within 30–60 minutes. Taking it on an empty stomach speeds up onset. The effect lasts 4–6 hours, but sexual stimulation is still required for an erection.
Some heart conditions allow safe Viagra use, but it must never be combined with Nitrate medications. Those with severe heart disease, heart failure, low blood pressure, or recent stroke/heart attack within 6 months must consult their doctor first.
Small amounts of alcohol are generally safe, but excessive drinking may reduce the medication's effectiveness and increase side effects such as headache, dizziness, and blood pressure drop. It's best to limit or avoid alcohol.
No. Viagra is not an aphrodisiac. It helps increase blood flow to the penis when sexually stimulated but does not cause an automatic erection. Sexual arousal or stimulation is still required.
Viagra is designed for on-demand use, not daily. If you need a daily ED medication, consider Cialis (Tadalafil) 5 mg, which is specifically designed for daily dosing.
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