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Written by Dr. M. Mansoor, MD, FCPS (Urology) | Medically Reviewed by BOD Team

What is Viagra (Sildenafil)?

Viagra is a prescription medication for erectile dysfunction that was first approved in 1998, making it the first-ever oral treatment for erectile dysfunction. It remains an iconic and trusted option thanks to its long-term safety, high success rate (82%, according to Sildenafil in the treatment of erectile dysfunction: an overview of the clinical evidence, Clinical Interventions in Aging, December 2006), and worldwide recognition.

Why Viagra still leads:

  • Over 25 years of safe use
  • Backed by extensive clinical research
  • Recognizable, proven brand
  • Generic availability as of 2020

Can You Buy Viagra Without Prescription in The US?

In the United States, Viagra is not available without a prescription in physical pharmacies. However, in many European countries and through Mexican or Canadian pharmacies, Viagra and its generics can be purchased without a prescription, and it's legal to order these medications online for personal use in most cases.

As international practice shows, ordering Viagra online without a prescription can be safe, as long as the following conditions are met:

  • You buy from a reputable online pharmacy with clear contact information
  • The product contains authentic sildenafil in the stated dose
  • You have previously used Viagra or a doctor has confirmed ED
  • You are not taking contraindicated medications (like nitrates)
  • You understand the correct dosage and usage instructions
  • The pharmacy offers discreet packaging and secure payment options

Always check your local laws and consult a doctor before starting any new medication.

Important note: When you buy Viagra without prescription online, make sure you order no more than a 90 days’ supply – such are the rules of importing medications for personal use. This helps avoid potential delays at customs.

Is Generic Viagra As Good As Original?

Generic Viagra is just as effective as the brand-name version. It’s been approved by the FDA as bioequivalent, meaning it works the same way in the body and delivers the same results. Generics contain the same active ingredient (sildenafil) in the same dose and strength, but at a fraction of the cost.

For many Americans, this is a lifeline. Insurance plans often don’t cover Viagra, and even with coverage, out-of-pocket prices can be steep. Generics offer a smarter, more affordable solution that doesn’t sacrifice quality, and it is easily accessible. More and more people are skipping the waiting room and ordering generic Viagra online from international pharmacies, making access easier, cheaper, and more discreet.

What makes generics slightly different from one another is the inactive ingredients, also called excipients: things like binding agents, coloring, and coating. These don’t affect how the drug works, but your body might react differently depending on the formulation. Some men find that a generic from one brand gives them headaches or upset stomach, while another doesn’t, even though the sildenafil is exactly the same.

Choosing a generic is not just economical, it’s also a socially responsible and sustainable choice that helps reduce healthcare costs and expand access worldwide. Realizing that you can achieve the same therapeutic results with fewer obstacles and at a significantly lower cost represents a practical and informed choice. It is, in essence, a smarter and more efficient approach to treatment.

How Do You Take Viagra Safely?

Viagra comes in doses 25mg, 50mg and 100mg. The efficacy depends on a) patient’s condition and b) the dose, which should be determined by the doctor.

Take one recommended dose of Viagra at least 60 minutes (but no later than 4 hours) before planned sexual activity, but no more than once a day. Always consult your doctor if you have heart issues or take other prescriptions.

Avoid the following around the intake of sildenafil:

  • Alcohol
  • Grapefruit and grapefruit juice
  • Nitrate medications

Check for full drug compatibility with your doctor.

How Long it Takes to Work & Lasts

Taken before the anticipated sexual intimacy, sildenafil will set in after 40-60 minutes. You may experience slight flushing and tingling sensation in the hands as the first signs of the drug working.

Viagra’s effectiveness peaks 1-2 hours following the intake. You will experience the effects of sildenafil for 4-6 hours, depending on the dose and individual response.

Note that sexual stimulation is required for Viagra to work.

Side Effects to Know

The following side effects are considered common (appear in 1% to 10% of subjects):

  • Headache
  • Flushing
  • Stomach upset
  • Nausea
  • Bluish vision

These side effects usually go away on their own a few hours, and disappear with continued use. If not, talk to your doctor about dose adjustment.

Notify your prescriber immediately and seek urgent medical help if you experience any of the following rare side effects of Viagra (occurring in 0,1% to 0,01% if subjects):

  • Allergic reaction (rash, swelling, difficulty breathing)
  • Pain in the chest or arm
  • Dizziness, fainting
  • Erection lasting over 4 hours
  • Bluish vision

Many people experience no side effects, or they are so mild that they do not register.

Is Viagra Safe?

Sildenafil has a safety record track of over 25 years, with multiple long-term side effect studies proving its ultimate safety. Generic Viagra produced by licensed pharmaceutical companies is held to the same safety standards.

Where to get Viagra in the US

Most physical pharmacies in the US carry the original Viagra as well as a few versions of generic sildenafil. Online pharmacies tend to offer more diversified choice of Viagra generics, as well as lower price ranges.

Common Questions About Viagra

Is Viagra for me?

If you suspect that you have erectile dysfunction, have it confirmed by a board-certified specialist. Most men respond well to Viagra therapy, but it is important to go through every possible contraindication and doubt with your doctor.

Viagra is for men older than 18 years of age. Use with caution after 75. Generally, older age is not a contraindication for the use of Viagra, given that the patient has no other health condition that would make the use of sildenafil unsafe.

Can I Use Viagra Even if I Don’t Need It?

Viagra is a prescription medication developed specifically to treat erectile dysfunction, and it is not intended for recreational or non-therapeutic use. However, many men who use Viagra without having ED report improved erection quality, better control, and heightened sexual confidence.

Some medical professionals have even explored the idea of proactive use of sildenafil. For example, Professor Irwin Goldstein, a urologist from Boston University, has advocated for daily low-dose Viagra use to help maintain long-term erectile function, suggesting it could help prevent impotence by preserving healthy nocturnal erections. Others in the field, like Dr. Natan Bar-Chama of Mount Sinai, support this approach, though it remains controversial and lacks broad clinical endorsement.

Still, it is important to remember that Viagra is a pharmaceutical drug, not a recreational enhancer. It can cause side effects such as headache, dizziness, vision changes, muscle or back pain, and in rare cases, priapism (a painful, prolonged erection). These risks can increase when used in combination with other substances, such as poppers, cannabis, or party drugs. Men who self-medicate often receive inaccurate dosage information or overlook interactions with other medications, particularly those for heart conditions.

In short: using Viagra without medical need or supervision may offer short-term benefits, but it carries real risks. If you’re considering trying it—whether for performance, curiosity, or prevention—speak to a healthcare provider first. Responsible use is essential, even for something marketed as a “miracle drug.”

Viagra or Cialis – which is best?

Both drugs have similar effects that differ in duration – the effect of Cialis lasts for 36 hours. Inexplicably, some men respond better to Viagra than they do to Cialis or Levitra (another drug in the same class with very similar effects and effect duration of 4 hours), and the other way around. Doctor will recommend a drug for you based on your preferences, and adjust your dose or molecule based on your response. Additionally, generics provide for better therapeutic flexibility with their dose and form variations.

Who Should Not Have Viagra?

Men with heart, liver, kidney, blood cell diseases should not take Viagra. Some other conditions are contraindicatory for sildenafil use, check for the full list with your doctor and in manufacturer’s insert to Viagra

Is There a Natural Viagra?

The short answer is, there is no herbal solution that is as effective as sildenafil. With this said, some supplements provide a powerful boost to both cardiovascular system and libido, but even fully organic formular have their contraindications and should never be used without doctor’s recommendations, even when sold over the counter.