Vision problems: Many studies report that the use of Viagra in high doses can cause mild and transient visual symptoms such as a bluish tinge to vision and an increased perception of brightness.

Other targets: Side effects

The side effects of the medication include: Hypersensitivity reactions: Mild rashes, hives, chest tightness, breathing difficulty to even anaphylactic shock. General systemic effects: Headache, flushing, heartburn, muscle cramps, giddiness, trouble with sleep. Painful erection (priapism): In some individuals, Viagra can cause priapism. This is a condition in which there is a long-lasting and painful erection. Priapism is a medical emergency that needs to be treated right away or it may damage the penis tissue and cause irreversible erectile dysfunction. These symptoms are temporary and do not cause any long-term vision damage.

Product Dosage Quantity + Bonus Price
Viagra Super Active100mg180 + 20 Pills280.97€ 267.59€
Viagra Generic50mg120 + 6 Pills129.64€ 123.47€
Viagra Oral Jelly100mg21 Sachets78.66€ 74.91€
Viagra Generic50mg60 + 4 Pills83.93€ 79.93€
Viagra Generic25mg180 + 6 Pills154.93€ 147.55€
Viagra Original100mg22 + 2 Pills120.71€ 114.96€
Viagra Generic50mg360 + 10 Pills225.33€ 214.60€
Viagra Generic50mg20 Pills40.52€ 38.59€
Viagra Super Active100mg120 + 16 Pills198.37€ 188.92€
Viagra Generic150mg60 + 4 Pills111.25€ 105.95€

Elderly patients (65 years and above) who have age-related liver, kidney, or heart problems should start Viagra in the lowest possible doses to generic viagra professional sildenafil 100mg reduce the incidences of adverse reactions. Have a heart condition that requires you to take isosorbide dinitrate, isosorbide mononitrate, or nitroglycerin, or if you take drugs such as riociguat or ritonavir. These drugs along with Viagra can cause a sudden drop in blood pressure that may trigger a heart attack in some. These drugs give an instant high when inhaled but can cause a dangerous (even fatal) drop in blood pressure if taken together with Viagra.

Potential Side Effects:

For erectile dysfunction, the drug must be taken only as required, preferably 30 minutes before the act. DO NOT take more than two doses in a day. The recommended dose for adults aged 18 to 64 years is 50 mg. Adults over the age of 65 years often start with the lower dose, 25 mg. The dose could be increased to 100 mg depending on how effective it is and how well it's tolerated.

Heart health and erectile dysfunction

Other than erectile dysfunction, Viagra is also used for treating a condition called pulmonary hypertension (high blood pressure in the lungs). This condition may require you to take Viagra daily, but the dosage, in this case, is different. Though the U.S. Food and Drug Administration (FDA) has not approved the use of Viagra in females for low libido, many women use this drug, as the improved blood flow to their genitals causes improved receptiveness and sensations. This is especially true when a woman is on the verge of menopause. This can produce hot flushes in men, which are very uncomfortable. Ultrafine Wildfire Smoke Particles May Pose Serious Health Risks High Fitness Doesn't Raise A-fib Risk in Young Men Weight Loss Program Helps Women Battling Breast Cancer Cheaper, Alternative Health Plans Are Having a Moment Antibiotics Won't Help Ease Asthma-Linked Wheezing in Kids avanafilAvanafil is a medication prescribed for the treatment of impotence (erectile dysfunction) in men by helping the persistence of cyclic guanosine monophosphate (cGMP), which leads to more prolonged.. Flomax and Viagra for BPH TreatmentFlomax (brand name tamsulosin) is a medication doctors prescribe to males who have an enlarged prostate gland and who are having difficulty urinating due to a condition called benign prostatic..

Other Uses for ED Medications

The U.S. Food and Drug Administration has approved the use of sildenafil (brand name Viagra) only in “men” older than 18 years. Pfizer, the company that manufactures this drug, has confirmed that the typical Viagra user is on average 53 years old. The company does not keep records of users younger than 33 years. The drug should not be used in young men who do not have erection problems.

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Recreational use of Viagra as an “enhancement” pill is strongly discouraged, as the pill can cause serious side effects. If you are in your twenties or thirties and suffer from “bedroom problems,” it is important to find out the exact cause and contact your doctor for its treatment. Simply put, Viagra (sildenafil) works by improving the blood supply to the genitals. This helps in venous engorgement in the penile tissue and thus a stronger erection. It also cuts down the refractory period in men, that is a man using Viagra can get the next erection within 10 minutes, rather than 20 (which is normal). sildenafilSildenafil is a medication prescribed for the treatment of impotence (erectile dysfunction, ED) caused by medical or psychological conditions.

Related/similar drugs

Viagra is not useful for those who have performance anxiety or other physical issues such as structural deformities of the penis. Erectile dysfunction is a condition seen in males where the penis does not harden when a man is sexually excited or when he cannot maintain an erection long enough to penetrate the partner. When a man is sexually stimulated, the body's normal response is increased blood flow to the penis, which causes an erection. Sildenafil causes chemical changes in the penile blood vessels that help maintain an erection after the penis is stroked. Without physical stimulus such as buy generic viagra online fondling or stroking, sildenafil will not cause an erection.

Does age affect Viagra dosage? If so, what would the dosage be for a 70-year-old vs. a 30-year-old?

No, Viagra is not a psychoactive drug. Therefore, you do not become physically dependent on it. That means its use will not cause withdrawal symptoms. However, psychological dependence may be seen in some people. It is therefore advised to take it only as directed and in recommended doses. The most common side effects are facial flushing (1 in.. What Is the Fastest Way To Cure Erectile Dysfunction?Learn about the symptoms of erectile dysfunction, treatment options, and the quickest way to help you resolve the condition.

  • Underlying Health Conditions: Diabetes, hypertension, and high cholesterol are major contributors.
  • Neurological Disorders: Multiple sclerosis, Parkinson's disease, and spinal injuries can cause ED.
  • Peyronie's Disease: Scar tissue causing curved, painful erections that may require treatment.
  • Post-Prostatectomy ED: Common after prostate cancer surgery; nerve-sparing techniques help.
  • Low Testosterone: Can reduce libido and erectile quality; requires diagnosis via blood test.

It is more likely that you'll develop erectile dysfunction as you get..

reating Erectile Dysfunction

Many studies have confirmed that Viagra may not necessarily treat low sexual drive in women, as women do not have “erection.” The sexual response in women is a complex psychological phenomenon with emotional, hormonal, and physical stimuli. There are other FDA-approved drugs to treat low libido in women. Talk to your doctor to find out which is best for you. That is why you must discuss it with your doctor before you start Viagra. The drug is capable of many drug-drug interactions causing unpleasant side effects or reducing the potency of other drugs you take. What Is the Female Version of Viagra Called?The FDA approved two versions of female Viagra to treat female sexual dysfunction, which are called flibanserin (Addyi) and bremelanotide. Yohimbine has also been used as a street drug,..

  • Defining "Best": The most effective treatment is the one that is safe, effective, and suitable for *you*.
  • Individual Biology: Responses vary greatly; a drug that works for one man may not for another.
  • Holistic Approach: Combining medical treatment with lifestyle optimization yields the best long-term results.
  • Professional Guidance Is Key: Self-diagnosis and treatment can be dangerous; see a healthcare provider.
  • Hope and Options: Virtually every case of ED has a management strategy; effective help is available.

All content on this page has been medically reviewed by: Hassan Thwaini, Clinical Pharmacist and Copywriter, Master of Pharmacy (MPharm) on 30 March, 2026. Sildenafil is an effective treatment for erectile dysfunction. It contains the same active ingredient as branded alternatives. Sildenafil works by encouraging more blood to flow to the penis, ensuring a strong erection when you need one.

Country Prescription Needed Over-the-counter Sales Allowed Online Sales Restrictions Notes
USA Yes No Strict regulation Prescription mandatory for all brands
UK Yes No Strict online regulation Prescription required, licensed pharmacies only
India No Yes (online) Looser regulation Still recommend consultation before use
Australia Yes No Online restrictions apply Prescription compulsory in most states

It’s effective for 82% of men.1 Find the clinically proven ED treatment that suits you best. BSc (Hons) MBBS MRCGP AFHEA MA (Hons) AFMCP “Efficacy and Safety of Sildenafil Citrate for Treatment of Erectile Dysfunction in a Population With Associated Organic Risk Factors.” Journal of Andrology (2013).

  • Viagra Sildenafil: The most widely used ED medication, effective within 30-60 minutes, lasting 4-6 hours, requires prescription.
  • Generic Sildenafil: Affordable alternative to Viagra, identical active ingredient, equally effective, available at pharmacies worldwide.
  • Viagra Coated Tablets: Designed for faster disintegration in the mouth, for quicker onset, but consult a doctor before use.

“Efficacy and Safety of Sildenafil Citrate for Treatment of Erectile Dysfunction in a Population With Associated Organic Risk Factors.” Journal of Andrology (2013). Cialis lasts up to 36 hours, making it a long-acting option. Viagra works faster, with effects in 30 minutes, but lasts only about four hours. Cialis is also approved for treating an enlarged prostate and has fewer food restrictions. Cialis and Viagra both work to treat erectile dysfunction, but they differ significantly in how long they last and when they start working.

What’s the Best Viagra for Men?

In the U.S., you can legally buy generic Viagra (sildenafil) online, but only with a prescription from a licensed healthcare professional. Sildenafil for erectile dysfunction is not an over‑the‑counter (OTC) medicine in the U.S., so you cannot legally buy it without a prescription. Cialis vs Viagra - What's the difference between them? Do you know these 11 amazing facts about Viagra? Is generic Viagra available in the U.S.?

What would happen if I took a larger dose of Viagra than my doctor prescribed — for example, 150 mg or 200 mg?

Does generic Viagra work just like regular Viagra? Remember, keep this and all other medicines out of the reach of children, never share your medicines with others, and use Viagra only for the indication prescribed. Always consult your healthcare provider to ensure the information displayed on this page applies to your personal circumstances. Viagra (sildenafil) is one of the world’s most popular drugs that has changed the lives of countless couples by managing male erectile dysfunction. However, you should not use this medication without consulting a healthcare professional. While Cialis can last up to 36 hours, Viagra offers a quicker onset within 30 minutes. Cialis (tadalafil) and Viagra (sildenafil) are both phosphodiesterase type 5 (PDE5) inhibitors used to treat erectile dysfunction (ED).

  • Counterfeit Pills: Extremely common online; may contain incorrect doses or harmful substances.
  • "Herbal Viagra" Products: Often illegally laced with prescription drugs like Sildenafil.
  • Too-Good-To-Be-True Prices: A major red flag for counterfeit or substandard medications.
  • Lack of Prescription Requirement: Legitimate sources require a consultation with a licensed provider.
  • Fake Pharmacy Websites: Check for physical address, pharmacist contact, and VIPPS seal.

They increase blood flow to the penis, which helps produce an erection suitable for sex. A key difference between Cialis and Viagra is their duration of action, largely determined by their biological half-life.

Brand Name Active Ingredient Typical Dosage Manufacturer Price Range ($ per pill)
Viagra Sildenafil citrate 50mg, 100mg Pfizer 10 - 25
Kamagra Sildenafil citrate 50mg, 100mg Ajanta Pharma 5 - 15
Caverta Sildenafil citrate 50mg, 100mg Ajanta Pharma 8 - 20
Revatio Sildenafil citrate 20mg, 40mg Pfizer 15 - 30

This refers to the time it takes for drug levels in the bloodstream to drop by half. Cialis has a longer half-life than Viagra, leading to a longer duration of action: Cialis: Works up to 36 hours (giving it the nickname "the weekend pill") Viagra: Works up to around four hours, with the strongest effects seen in the first two hours PDE5 inhibitors prevent the breakdown of cyclic guanosine monophosphate (cGMP), which relaxes blood vessels and increases blood flow to the penis for stronger erections. The onset of action, or how quickly Cialis and Viagra work, depends on their peak plasma concentration—the point when the drug reaches its highest level in the blood after liver metabolism. With Cialis, the peak plasma concentration is reached in around two hours, translating to an onset of action of roughly one hour. With Viagra, the peak plasma concentration is reached in around one hour, translating to an onset of action of 30 minutes or less. Cialis and Viagra share mechanisms of action but differ in side effects.