Viagra

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Viagra, also known under the generic name Sildenafil, is used to treat erectile dysfunction (impotence) in adult men. Erectile dysfunction (ED) is characterized by a repetitive inability to get or maintain an erection firm and long enough to have sexual intercourse because not enough blood is flowing into the penis during sexual stimulation, which prevents the erection to occur. ED affects about 30 million men in the U.S. and can be a sign of stress or relationship problems, but can also be linked to other health problems that need medical attention. Treatment for ED will depend on the underlying cause of the problem, but physicians may prescribe medication to manage the symptoms. You will find here information on Viagra 25mg, 50mg, and 100mg tablets, which doctors at Medzino can issue a prescription for to treat ED if you are suitable.

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Quantity Strength Price
3 tablets100mg$273.00
6 tablets100mg$486.00
10 tablets100mg$770.00
3 tablets25mg$275.10
6 tablets25mg$495.00
10 tablets25mg$790.00
3 tablets50mg$275.10
6 tablets50mg$495.00
10 tablets50mg$790.00
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Information

Reviewed by Dr Yasmin Aghajan, MD

Information last reviewed 07/17/19

About

What is Viagra?

Viagra (Sildenafil) is a type of erectile dysfunction treatment known as a PDE-5 inhibitor. Viagra comes in the form of a blue and rounded-diamond-shaped tablet that can be supplied at the concentrations of 25mg, 50mg, and 100mg for oral administration (by mouth).

What does Viagra treat?

Viagra, also known under the generic name Sildenafil, is used to treat erectile dysfunction (impotence) in adult men. Erectile dysfunction (ED) is characterized by a repetitive inability to get or maintain an erection firm and long enough to have sexual intercourse because not enough blood flows to the penis during sexual stimulation, which prevents the erection to occur. ED affects about 30 million men in the U.S. and can be a sign of stress or relationship problems, but can also be linked to other health problems that need medical attention. Treatment for ED will depend on the underlying cause of the problem, but physicians may prescribe medication to manage the symptoms.

How does Viagra work?

Viagra works by relaxing muscles of the blood vessels and increases blood flow to the penis, which helps men get an erection when they are sexually stimulated. Indeed, the nervous system in your penis releases something called nitric oxide (NO). NO in turn stimulates an enzyme that produces cGMP (cyclic guanosine monophosphate), which basically helps relax the smooth muscle cells. This allows the blood vessels that bring blood flow to the penis to dilate (become larger), thereby increasing the blood supply and allowing an erection to occur. Note that Viagra only works if you are sexually stimulated and that it does not protect you against sexually transmitted infections (STIs) and HIV.

Ingredients

Active ingredients

The active ingredient in Viagra is sildenafil citrate. This substance is a type of PDE-5 inhibitor, which means that it works by allowing the blood vessels around the penis to relax and widen, improving blood flow and allowing you to get and maintain an erection.

Inactive ingredients

Viagra also contains the following inactive ingredients: microcrystalline cellulose, anhydrous dibasic calcium phosphate, croscarmellose sodium, magnesium stearate, hypromellose, titanium dioxide,lactose, triacetin, and FD&C Blue#2 aluminum lake.

Dosage

Viagra dosage

Generally, the recommended dosage in adults is 50mg, taken as needed, approximately 1 hour before having sex. Alternatively, Viagra may also be taken anywhere from 4 hours to 0.5 hour before sexual activity, but note that you should not use Viagra more than once a day. Dosage will also vary depending on effectiveness and toleration. It may be increased to 100mg or decreased to 25mg.

How to take Viagra

Viagra should be taken orally (by mouth) with a glass of water approximately 1 hour before sexual activity. 

It is a good idea to avoid having a high-fat meal before taking Viagra as this can delay the absorption and effects of the medicine. You should also avoid drinking too much alcohol when taking Viagra as this may interfere with your ability to get an erection.

Side Effects

Side Effects

General side effects include:

  • Headache
  • Indigestion (Dyspepsia)
  • Urinary tract infection
  • Visual disturbance (blue tinge to vision, blurred vision, increased sensitivity to light)
  • Dizziness
  • Rash
  • Diarrhea
  • Muscle pain (Myalgia)
  • Nasal congestion
  • Flushing
  • Respiratory tract infection
  • Joint pain (Arthralgia)

Rare but serious side effects include:

  • Priapism (erection that won’t go away): If your erection lasts more than 4 hours, get immediate medical help as this might cause significant and lasting damage to your penis, including the inability to have erections.
  • Sudden loss of vision in one or both eyes (Nonarteritic anterior ischemic optic neuropathy (NAION))
  • Sudden loss or decrease in hearing
  • Chest pains
  • Serious skin reaction with symptoms including fever, severe peeling and swelling of the skin, blistering of the mouth, genitals and around the eyes
  • Seizures

If you experience any of these rare but serious side effects, seek immediate medical attention.

Contraindications

  • Patients who take alpha-blockers and anti-hypertensive medications to treat high blood pressure should be cautious about taking the alpha-blockers and Viagra at the same time as this may drop their blood pressure to dangerously low levels and cause dizziness, lightheadedness, and fainting. Always inform and consult your doctor about the medicines you take before using Viagra to discuss potential risks.
  • Viagra is contraindicated in patients who are allergic to Sildenafil. Get immediate medical help if you experience an allergic reaction: rash, itching or swelling of the tongue/face/throat, difficulty breathing, severe dizziness.
  • Do not take Viagra if you take medicines called ‘nitrates’, which are commonly used to treat angina (symptom of heart disease causing pain such as chest, jaw or arm pain).
  • Patients who suffer from a heart condition or have a history of cardiovascular problems, should first ask their physicians if it is safe for them to engage in sexual activity to begin with. If you experience symptoms such as angina pectoris, dizziness or nausea upon engaging in sexual activity, stop any further activity and seek medical advice.
  • If you have suffered a recent stroke or heart attack, talk to your doctor about taking Viagra and the potential risks involved.

Drug interactions

Some drugs may interfere with the effects of Viagra or may be affected by the use of Viagra. Examples of these include organic nitrates, blood pressure medications (e.g. Amlodipine), other medicines to treat erectile dysfunction (e.g. Cialis), or certain HIV medications (e.g. Ritonavir). Do not take these medicines at the same time and consult your physician first to talk about all the medicines you take.

Q&A

Disclaimer: This is not medical advice. You and your physician will determine if and how you should take any medication prescribed to you following a medical consultation.

  1. Viagra, [website], https://www.viagra.com/learning/what-is-ed [last accessed 27 March 2019]
  2. BPAS, ‘Viagra (Sildenafil) facts’, [website],  https://www.bpas.org/more-services-information/erectile-dysfunction/viagra/ [last accessed 27 March 2019]
  3. FDA, ‘Viagra’, January 2010, https://www.accessdata.fda.gov/drugsatfda_docs/label/2010/020895s033lbl.pdf [last accessed 27 March 2019]
  4. Assured Pharmacy, ‘How should I use Viagra for the First Time?’, [website], 15 November 2016, https://www.assuredpharmacy.co.uk/blog/viagra/how-should-i-use-viagra-for-first-time/ [last accessed 27 March 2019]
  5. NHS, ‘Sildenafil (Viagra), [website], 22 January 2019, https://www.nhs.uk/medicines/sildenafil-viagra/ [last accessed 27 March 2019]
  6. RxList, ‘Viagra’, [website], 30 October 2018, https://www.rxlist.com/viagra-drug.htm#description [last accessed 27 March 2019]
  7. Medical News Today, ‘Uses and Risks of Viagra’ ), [website], 19 November 2018, https://www.medicalnewstoday.com/articles/232912.php [last accessed 27 March 2019]

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