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Some medicines can affect how sildenafil works.

Side effects of Viagra

Painful or prolonged erection (seek emergency medical help if an erection lasts more than 4 hours) Painful or prolonged erection (seek emergency medical help if an erection lasts more than 4 hours) Sudden vision loss or hearing problems, which require emergency medical care Sudden vision loss or hearing problems, which require emergency medical care Keep all medicine out of the reach of children. Keep all medicine out of the reach of children. Before taking Viagra, tell your healthcare provider about all the medications you take, including prescription and nonprescription drugs, vitamins, and dietary supplements. Avoid alcohol and grapefruit juice while taking Viagra. While taking Viagra, do not take other medicines that contain sildenafil—or similar ED medicines, such as Cialis (tadalafil) or Levitra (vardenafil). If you have symptoms of an allergic reaction, such as hives, trouble breathing, or swelling of the face, lips, tongue, or throat, get emergency medical help.

You should also get emergency medical help if you have: Symptoms of a heart attack, such as chest pain, pain that spreads to the jaw or shoulder, nausea, or sweating Symptoms of a heart attack, such as chest pain, pain that spreads to the jaw or shoulder, nausea, or sweating An erection that lasts longer than 4 hours (priapism) An erection that lasts longer than 4 hours (priapism) Sudden decrease or loss of hearing; ringing in the ears Sudden decrease or loss of hearing; ringing in the ears Painful erection or an erection that lasts longer than 4 hours Painful erection or an erection

that lasts longer than 4 hours Some common side effects of Viagra include: Seeing a blue tinge on objects or having difficulty differentiating blue and green Seeing a blue tinge on objects or having difficulty differentiating blue and green Viagra, National Library of Medicine DailyMed (2017) Viagra, National Library of Medicine DailyMed

Multimedia Files:

Andersson K-E, Wagner G. Physiology of penile erection. The role of nitric oxide in the physiology of erection. Sildenafil: an orally active type 5 cyclic GMP-specific phosphodiesterase inhibitor for the treatment of penile erectile dysfunction. Sildenafil, a novel effective oral therapy for male erectile dysfunction.

Can you cut 100 mg of Viagra in half?

The design and analysis of sequential clinical trials. Planning and evaluation of sequential trials, version 3. Ditunno JF Jr, Young W, Donovan WH, Creasey G. The international standards booklet for neurological and functional classification of spinal cord injury. Citation information is sourced from Crossref Cited-by service.

What happens when you take Viagra for the first time?

If you have the appropriate software installed, you can download article citation data to the citation manager of your choice. Select your manager software from the list below and click Download. Sexual Health After Neurological Disorders: A Comprehensive Umbrella Review of Treatment Evidence, Medical Sciences, 14, 1, (37), (2026). Evolving medical management of erectile dysfunction: recommendations from the Fifth International Consultation on Sexual Medicine (ICSM 2024), Sexual Medicine Reviews, 13, 4, (513-537), (2025). Sexual Dysfunction Following Spinal Cord Injury: Insights into Pathophysiology and Management Approaches, Journal of Surgery and Trauma, 13, 1, (1-7), (2025). (2017) Sildenafil tablets (erectile dysfunction), Cleveland Clinic (2023) Sildenafil tablets (erectile dysfunction), Cleveland Clinic (2023) Sildenafil, National Library of Medicine MedlinePlus (2023) Sildenafil, National Library of Medicine MedlinePlus (2023) After receiving her doctorate from the University of Pittsburgh School of Pharmacy, Karen Berger, Pharm.D., has worked in both chain and independent community pharmacies.

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Who We Are

A generic form of sildenafil (marketed under the brand name Revatio) is used to treat pulmonary arterial hypertension (high blood pressure in the lungs). Viagra is a medication used to treat erectile dysfunction. Viagra belongs to a group of medications called PDE5 inhibitors. Viagra was discovered by the drug company Pfizer and was approved by the United States Food and Drug Administration (FDA) in 1998. For erectile dysfunction, Viagra is commonly prescribed.

Pick up your Viagra prescription.

It is used for erectile dysfunction, in combination with sexual stimulation. The usual recommended dose is 50 mg taken once, as needed, about one hour prior to sexual activity. However, Viagra can be taken anywhere from 4 hours prior to sexual activity up until 30 minutes prior to sexual activity. Do not exceed one tablet daily, regardless of the dosage. You viagra super can take Viagra with or without food.

Cialis lasts longer than Viagra but may have more side effects

Your healthcare provider may change the dose if required—for example, to a lower dose of 25 mg, or a higher dose of 100 mg. Before taking Viagra, carefully read the prescription label and patient information leaflet. Ask your healthcare provider or pharmacist if you have any questions. Your doctor will tell you how much medicine to use. For erectile dysfunction: Take this medicine about 1 hour before you have sex. (Gray News) - A company that sells adult novelty products has voluntarily recalled two chocolate products.

Stay in the know

Tell your doctor if you are pregnant or breastfeeding, or if you have kidney problems, liver disease, bleeding conditions, eye or vision problems, a history of medical conditions of the penis, any type of blood pressure or heart problems, stomach bleeding, or blood diseases like sickle cell anemia or leukemia. Also, tell your doctor if you smoke. Tell any doctor who treats you that you take sildenafil. This medicine may cause the following problems:Low blood pressure (especially if taken with other medicines that lower blood pressure) and faintingHeart problems: if during sexual activity, you become dizzy or nauseous, or have pain or numbness in the chest, arms, neck, or jaw, stop immediately and get emergency medical help.Painful or prolonged erection (seek emergency medical help if an erection lasts more than 4 hours)Sudden vision loss or hearing problems, which require emergency medical care This medicine may cause the following problems: Low blood pressure (especially if taken with other medicines that lower blood pressure) and fainting Low blood pressure (especially if taken with other medicines that lower blood pressure) and fainting Heart problems: if during sexual activity, you become dizzy or nauseous, or have pain or numbness in the chest, arms, neck, or jaw, stop immediately and get emergency medical help. Heart problems: if during sexual activity, you become dizzy or nauseous, or have pain or numbness in the chest, arms, neck, or jaw, stop immediately and get emergency medical help. The U.S.

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Do not take it more than once a day. Always allow at least 24 hours between doses. Viagra only works in combination with sexual stimulation. You will not have an erection just by taking a tablet. Store the medicine at room temperature, away from heat, moisture, and direct light.

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Keep out of reach and out of sight of children and pets. Keep the bottle tightly closed when not in use. Do not share your medication with anyone. While taking Viagra, avoid alcohol and grapefruit juice. Also, do not take other medications that treat ED.

What is the difference between Viagra, Cialis, and Levitra?

Viagra is only taken once as needed. This medicine is not right for everyone. Do not use it if you have had an allergic reaction to sildenafil, Viagra, Revatio, or any ingredients in the medication. Do not take Viagra if you are taking a nitrate drug such as nitroglycerin tablets or isosorbide mononitrate. People who are taking a guanylate cyclase stimulator, such as Adempas (riociguat) or Verquvo (vericiguat), should not take Viagra. Food and Drug Administration announced the recall, saying the Gear Isle chocolates in question were found to contain potentially “life-threatening” amounts of prescription drug ingredients, sildenafil and tadalafil, that are commonly used to treat erectile dysfunction and found in Viagra. The two products listed in the recall are Gold Lion Aphrodisiac Chocolate Male Enhancement Sachet and iLum Sex Chocolate Male Sexual Enhancement Booster.

Care & Cleaning

Revolutionising Neurological Therapeutics: Investigating Drug Repurposing Strategies, CNS & Neurological Disorders - Drug Targets, 24, 2, (115-131), (2025). Which PDE5 inhibitor is the most effective in the treatment of erectile dysfunction in men with spinal cord injury? A systematic review and network meta‐analysis, Andrology, 13, 2, (314-322), (2024). Drug Repurposing for Spinal Cord Injury: Progress Towards Therapeutic Intervention for Primary Factors and Secondary Complications, Pharmaceutical Medicine, 37, 6, (463-490), (2023). Sexuality, Intimacy, and Reproductive Health after Spinal Cord Injury, Journal of Personalized Medicine, 12, 12, (1985), (2022).

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Autonomic Dysfunction in Neuromuscular Disorders, Neuromuscular Disorders, (97-117), (2022). A validated LC-MS/MS assay for the quantification of phosphodiesterase-5 inhibitors in human plasma, Journal of Chromatography B, 1179, (122829), (2021). Sexual Dysfunction After Spinal Cord Injury, Current Sexual Health Reports, 12, 4, (244-250), (2020). Check if you have access through your login credentials or your institution to get full access on this article. Purchase this article to access the full text.

The Role of Vitamin D in a Healthy Pregnancy

Viagra is a prescription medicine used for erectile dysfunction (ED), which is difficulty in achieving and maintaining an erection. It is part of a class of drugs called phosphodiesterase-5 (PDE5) inhibitors. Combined with sexual stimulation, Viagra works by increasing blood flow to the penis. Viagra is available as a tablet that is taken by mouth about one hour prior to sexual activity. Used in combination with sexual stimulation for erectile dysfunction. According to the recall, the use of the products may pose a threat to consumers because the active ingredient may interact with nitrates found in some prescription drugs (such as nitroglycerin) and may cause a significant drop in blood pressure that may be life-threatening.

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