Sildenafil (Generic Viagra)

(℞) Prescription Required - Sildenafil is the Generic Equivalent of Viagra

    What Is Sildenafil Used For?

    Sildenafil citrate, sold under the brand name Viagra and manufactured by American pharmaceutical company, Pfizer Inc., is a prescription medication used commonly to treat erectile dysfunction, while it was originally developed to treat pulmonary arterial hypertension (high blood pressure). Viagra is also sold under the brand name Revatio.

    The iconic blue diamond-shaped pill works by relaxing the muscles within the wall of blood vessels in specific areas of the body, namely the male penis. Known as a Phosphodiesterase type 5 (PDE-5) inhibitor, Viagra works by maintaining the level of messenger cyclic guanosine monophosphate (cGMP) created by nitric oxide stimulation, enabling blood flow to the penis and its smooth muscle cells to continue when sexual stimulation occurs.

    While Viagra works to improve erectile response, there is a common misconception that Viagra provides sexual stimulation, which it does not. Viagra only works when a man is sexually aroused. It’s also commonly used to psychologically treat the underlying causes of impotence - namely the cycle of anxiety and failure associated with being unable to produce an erection.

    How To Use Viagra For Best Results

    Viagra Dosage

    Your doctor can determine the dose that works best for you. Always take Viagra as prescribed by your doctor. You should speak with your doctor or pharmacist if you are unsure. A dose above 100 mg per day is not recommended.

    You should not take more than one dose of Viagra per day.

    You should take Viagra approximately 30 to 60 minutes before sexual activity. You can engage in sexual activity within 30 minutes of taking the tablet and for up to 4 hours. The amount of time it takes to have an effect varies slightly from person to person. Remember, sexual stimulation is required for Viagra to work.

    You should avoid excessive drinking of alcohol, since alcohol can temporarily impair the ability to get an erection.

    Viagra can be taken with or without food. However, you may find that it takes longer for Viagra to work if you take it with a high-fat meal.

    Viagra may not work the first time or every time. If Viagra did not work for you on one occasion, try again on another day. You will learn how well Viagra works for you through your personal experience. The first few times may be charged with emotion or anxiety. If after a few separate attempts, you do not get the results you expect, talk to your doctor.

    If you have serious liver or kidney problems or you are 65 years of age or over, your doctor may start you at the lowest dose (25 mg) of Viagra. 


    Can You Overdose on Viagra?

    You should not take more than one dose of Viagra per day.

    If you have taken more Viagra than you should, contact your doctor or a poison control centre immediately.


    Who Should Not Take Viagra?

    While the vast majority of Viagra users report their sex lives dramatically changing for the better, there are of course some people who should consult their physician before using, or refrain from using Viagra altogether. They include:

    • People with HIV who take protease inhibitors
    • People who take alpha-blockers
    • People with kidney disease
    • Individuals with low blood pressure
    • Those who have had recent heart attack or stroke
    • Carriers of rare hereditary retinal disorders
    • People with severe liver impairments
    • Those who are advised by their doctor to refrain from sexual activity because of cardiovascular risk factors

    Viagra Side Effects

    As with most drugs, VIAGRA can cause some side effects. These effects are usually mild to moderate in nature and do not last for a long time.

    Viagra side effects may include:

    • Headache, facial flushing
    • Nausea, vomiting, indigestion, abdominal pain,
    • Dizziness
    • Dry, stuffy, or swollen nose
    • Throat tightness, dry mouth, decreased sensitivity of the mouth
    • Pain in arms and legs, myalgia (muscle pain)
    • Somnolence
    • Erection increased

    If you notice any side effects not mentioned above, or any of the above-mentioned side effects persist or become bothersome, please contact your doctor or pharmacist.


    Viagra Warnings and Precautions

    This medicine has been prescribed for you personally and you should not pass it on to others. It may harm them, even if their symptoms are the same as yours.

    Before you use Viagra talk to your doctor or pharmacist if you:

    • Have heart problems (irregular heart beats, angina, chest pain, or had a heart attack). If you have heart problems, ask your doctor if your heart is healthy enough to handle the extra strain of having sex. If you
    • Have chest pain, dizziness or nausea during sex, stop exerting yourself. You should not use nitrates but you should seek immediate medical assistance.
      are 65 years of age or over
    • Have had a stroke
    • Have low blood pressure or uncontrolled high blood pressure
    • Have liver or kidney problems
    • Have sickle cell anemia (abnormality of the red blood cells), multiple myeloma (cancer of the bone marrow) or leukaemia (cancer of the white blood cells)
    • Are allergic to sildenafil or any of the other ingredients of Viagra tablets
    • Have a deformed penis or Peyronie's disease
    • Have ever had an erection that lasted more than 4 hours
    • Have stomach ulcers or other bleeding problems
    • Have a rare inherited eye disease called retinitis pigmentosa
    • Have had temporary, decrease, or permanent loss of vision in one or both eyes, including a condition called Non-Arteritic Anterior Ischemic Optic Neuropathy (NAION). The specific type of vision decrease or loss, called non-arteritic anterior ischemic optic neuropathy (NAION), seems to occur rarely when blood flow to the optic nerve is reduced or blocked. Vision decrease or loss may be partial or complete, in one or very occasionally both eyes. While in some cases the condition may improve over time, it can also be irreversible.
    • Rare but serious skin reactions of Stevens-Johnson Syndrome (SJS) and Toxic Epidermal Necrolysis (TEN) have been reported during the post-marketing period.
    • Viagra is not recommended for use in children under 18 years of age and in women.

    Viagra does not protect against sexually transmitted diseases (STD), including Human Immunodeficiency Virus (HIV).

    Alcohol consumption may decrease the ability to get an erection.

    Patients should know how to react to the drug before operating a motor vehicle or any machinery.

    If you are taking Viagra and experience temporary, decrease, or permanent loss of vision, stop taking Viagra and call your doctor.

    In case of chest pain occurring during or after sexual activity you should not use nitrates but you should seek immediate medical assistance.

    Sudden decrease or loss of hearing has been reported in a few number of postmarketing and clinical trial cases with the use of PDE5 inhibitors, including Viagra. It has not been established whether these are related directly to the use of these medications or to other factors. If you experience these symptoms, stop taking Viagra and call your doctor.


    Interactions with this medication

    You should tell your doctor or pharmacist about any other medications that you are taking. Viagra may interfere with some drugs. Only take Viagra with other drugs if recommended by your doctor.

    Drugs that may interact with Viagra include:

    • Any drugs that contain nitrates in any form (oral, sublingual [under the tongue], skin patch or by inhalation [spray]). Nitrates are found in many prescriptions that are used to treat angina pectoris (chest pain due to heart disease). You should not take VIAGRA if you are taking these drugs.
    • Alpha-blockers (drugs used to treat prostate problems or high blood pressure)
    • Ketoconazole or itraconazole (drugs used to treat fungal infections)
    • Erythromycin (a drug used to treat bacterial infections)
    • Ritonavir, saquinavir or other drugs for the treatment of HIV
    • Cimetidine (a drug generally used to treat duodenal or gastric problems)
    • Bosentan (a drug used in the treatment of high blood pressure in the blood vessels between the heart and the lungs)
    • Drugs to treat erectile dysfunction. These drugs are Cialis, Levitra, Adcirca and Staxyn.
    • Other drugs that contain sildenafil. They can be called Revatio. They are used in the treatment of high blood pressure in the blood vessels between the heart and the lungs.
    • Grapefruit juice may increase the levels of Viagra in your blood.

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    The above information is an educational aid only. It is not intended as medical advice for individual conditions or treatments. Talk to your doctor, nurse or pharmacist before following any medical regimen to see if it is safe and effective for you.