Even though Viagra keeps working in your body for several hours, your erection shouldn’t last this long. In fact, in rare cases, Viagra can cause priapism (a long-lasting and sometimes painful erection). Priapism is a medical emergency that needs to be treated right away. If it’s not treated, the condition can damage the tissues in your penis and cause irreversible erectile dysfunction.

Viagra started being prescribed in the late 1990s for ED treatment.
The medication can be used by men of various age groups.
It’s important to avoid grapefruit or grapefruit juice while using Viagra.
Some patients may experience visual disturbances after taking it.
Viagra may cause priapism, a painful and prolonged erection.
Women should not take Viagra for sexual enhancement.

If you have an erection that lasts longer than 4 hours, go to the nearest emergency room or call 911. Viagra may work faster if you take it on an empty stomach.

7.1 Nitrates

You’ll find key information about Viagra below. Drug class: phosphodiesterase type 5 (PDE5) inhibitor In several clinical studies, Viagra was effective in treating erectile dysfunction (ED). In these studies, males who used the drug had an improved ability to have and keep erections during sexual activity. To learn more about Viagra’s effectiveness, see the “Viagra uses” section. Use of the term “male” in this article refers to sex assigned at birth.

What does Viagra do for ED?

Viagra typically starts to work between 30 and 60 minutes after you take a dose of the drug. But Viagra itself doesn’t give you viagra black an erection. You’ll need to be sexually aroused in order for the drug to work. Viagra keeps working in your body for up to 5 hours. This means that if you’re aroused, you should still be able to get an erection up to 4 hours after taking a dose of Viagra. If Viagra is taken with food, especially with a high fat meal, it will take longer to start working. And in this case, it could even be less effective for you.

Brand Name	Active Ingredient	Manufacturer	Price Range ($)	Availability
Viagra	Sildenafil citrate	Pfizer	20-50 per pill	U.S. and globally
Kamagra	Sildenafil citrate	Ajanta Pharma	10-35 per pill	Online
Sildenafil CT	Sildenafil citrate	Various	15-40 per pill	Online/Pharmacies
Vivanza	Vardenafil	Menarini	25-60 per pill	Europe & Asia

Viagra is approved to treat erectile dysfunction (ED) in males.

Product	Dosage	Quantity + Bonus	Price
Viagra Original	100mg	12 Pills	72.54€ 69.09€
Viagra Original	100mg	48 + 4 Pills	207.15€ 197.29€
Viagra Super Active	100mg	60 + 8 Pills	116.84€ 111.28€
Viagra Generic	25mg	360 + 10 Pills	213.68€ 203.50€
Viagra Generic	150mg	90 + 6 Pills	147.18€ 140.17€
Viagra Professional	100mg	20 Pills	71.14€ 67.75€
Viagra Generic	50mg	20 Pills	40.52€ 38.59€
Viagra Super Active	100mg	90 + 10 Pills	165.61€ 157.72€
Viagra Soft Tabs	100mg	20 Pills	62.99€ 59.99€
Viagra Generic	100mg	90 + 6 Pills	129.02€ 122.88€
Viagra Original	100mg	4 Pills	40.94€ 38.99€
Viagra Generic	25mg	10 Pills	25.19€ 23.99€
Viagra Original	100mg	76 + 4 Pills	306.59€ 291.99€
Viagra Generic	150mg	120 + 8 Pills	177.58€ 169.12€
Viagra Generic	25mg	90 + 6 Pills	105.03€ 100.03€
Viagra Soft Tabs	100mg	60 + 6 Pills	152.94€ 145.66€

With ED, you have trouble getting and keeping an erection that’s firm enough to allow you to have sex.

Viagra can be used with other ED medications but only under medical advice.
It is not effective if there is no underlying erectile dysfunction.
Lifestyle changes like exercise can enhance Viagra’s effectiveness.
Viagra may cause a sudden drop in blood pressure in some cases.
Men with certain health conditions should avoid using Viagra.
Report any adverse reactions to your healthcare provider immediately.

When you’re sexually aroused, your brain sends messages to your penis.

Myth	Fact	Explanation
Only old men use Viagra	Used by men of various ages	Prescribed across age groups
Viagra causes permanent erection	No, effects are temporary	Must be taken as prescribed
It increases sexual desire	Primarily improves erectile function	Does not directly affect libido
It is addictive	No evidence of addiction	Safe when used correctly

These messages cause certain chemicals to be released in your penis.

Mechanism of action

If it works well, stick with it. If it’s not working after a few tries, you can increase to 20mg. If you want to take tadalafil every day for constant effects, men usually start with 5mg. If it’s too strong or causes side effects, you can try a lower 2.5mg dose. Viagra is a medication used to treat erectile dysfunction by improving blood flow to the penis.

Does sildenafil interact with other medicines (drug interactions)?

The drug is available in different dosages. The appropriate dose depends on factors like age, kidney or liver problems, and other medications being taken. While generally considered safe, Viagra can cause side effects, including headaches and low blood pressure. It can also interact negatively with other medications like nitrates. Viagra is a brand-name oral tablet prescribed for erectile dysfunction (ED). One of these chemicals, called cyclic GMP, relaxes and widens certain blood vessels in your penis.

Further information

See the differences between our popular treatments to find what suits your lifestyle. *Compounded drugs aren’t FDA-approved or reviewed by the FDA. Each medication is a custom-made recommendation, based on an evaluation from a licensed medical provider. It’s 100% online and takes only 2 minutes to see your recommended treatments. All our board-cerified doctors and pharmacists are based in the US.

What drugs interact with Viagra (sildenafil)?

Sildenafil is a tablet that’s taken 30–60 minutes before sex. Its effects can last for up to 6 hours when aroused. Tadalafil is a tablet that can either be taken 30–60 minutes before sex at higher strengths (10mg/20mg), or daily at lower strengths (2.5mg/5mg) if you don’t want to plan ahead. The effects of tadalafil can last up to 36 hours when aroused. If you’re planing to take in an hour before sex, men usually start with the 10mg dose to minimize side effects. Cyclic GMP also relaxes the muscles around the erectile tissue in your penis that’s called the corpus cavernosum.

How much does Viagra cost?

The main causes of erectile dysfunction include psychological and health conditions, medications, trauma, and lifestyle factors. These may include depression, anxiety, stress, diabetes, cardiovascular disease, antiandrogens, appetite suppressants, and antidepressants, trauma due to an injury or a surgery, lack of exercise, or addictions (smoking). Penile erection is a complex process in which the brain, nerves, muscles and blood vessels play a major role. You are encouraged to report negative side effects of prescription drugs to the FDA. Visit the FDA MedWatch website or call 1-800-FDA-1088.

Pulmonary hypertension

Professional side effects and drug interactions sections courtesy of the U.S. Food and Drug Administration. Getting your confidence back has never been easier. Access FDA-approved erectile dysfunction pills by filling out a 2 minute online form. Then choose from recommended treatments, tailored for you. These actions allow blood to flow into the corpus cavernosum, which causes your penis to get hard and become erect.

How oral medicines differ

Common side effects of Viagra include facial flushing, headaches, stomach pain, nasal congestion, nausea, dizziness, rash, urinary tract infections (UTIs) diarrhea, and an inability to differentiate between the colors green and blue. Viagra has not been studied in pregnant women. Erectile Dysfunction (ED) Causes and TreatmentHaving erection problems? Learn about erectile dysfunction causes and treatments such as drugs.. Erectile Dysfunction (Impotence) Quiz: Causes & TreatmentDid you know that certain medical condition may be responsible for ED?

Natural and over-the-counter alternatives for ED

Some causes of impotence are medically treatable and.. Did you know that certain medical condition may be responsible for ED? Erectile DysfunctionErectile dysfunction (ED, impotence) is the failure to achieve or maintain an erection. There are many potential underlying causes of erectile dysfunction, including stress and emotional problems, brain dysfunction, problems with blood supply to the penis, and structural problems with the penis. Erectile dysfunction (ED, impotence) is the failure to achieve or maintain an erection. ED can occur if you have certain problems that affect your body’s ability to have an erection.

Why is this medication prescribed?

Cimetidine, erythromycin, ketoconazole, itraconazole, atazanavir, and mibefradil cause marked increases in the amount of Viagra in the body. Rifampin will decrease blood levels of Viagra and probably reduce its effectiveness. Although extensive testing in animals has demonstrated no negative effects on the fetus, Viagra has not been studied in pregnant women. There is no effect on sperm count or motility of sperm in men. It is not known whether Viagra is excreted into breast milk.

Recreational use

Approximately 15% of persons taking Viagra experience side effects. The following are discussed in more detail in other sections of the labeling: Hypotension when Co-administered with Alpha-blockers or Anti-hypertensives Adverse Reactions with the Concomitant Use of Ritonavir Combination with other PDE5 Inhibitors or Other Erectile Dysfunction Therapies The most common adverse reactions reported in clinical trials ( > 2%) are headache, flushing, dyspepsia, abnormal vision, nasal congestion, back pain, myalgia, nausea, dizziness, and rash. Viagra was administered to over 3700 patients (aged 19-87 years) during pre-marketing clinical trials worldwide. Table 1: Adverse Reactions Reported by ≥ viagra cream 2% of Patients Treated with Viagra and More Frequent than Placebo in Fixed-Dose Phase II/III Studies When Viagra was taken as recommended (on an as-needed basis) in flexible-dose, placebo-controlled clinical trials of two to twenty-six weeks duration, patients took Viagra at least once weekly, and the following adverse reactions were reported: Table 2: Adverse Reactions Reported by ≥ 2% of Patients Treated with Viagra and More Frequent than Placebo in Flexible-Dose Phase II/III Studies The following events occurred in < 2% of patients in controlled clinical trials; a causal relationship to Viagra is uncertain. The following adverse reactions have been identified during post-approval use of Viagra. The condition can result from problems with messages being sent from your brain.

When oral medications might not be safe

It is not possible to determine whether these events are related directly to Viagra, to sexual activity, to the patient's underlying cardiovascular disease, to a combination of these factors, or to other factors. It is not possible to determine whether these reported events are related directly to the use of Viagra, to the patient's underlying risk factors for hearing loss, a combination of these factors, or to other factors. Most, but not all, of these patients had underlying anatomic or vascular risk factors for developing NAION, including but not necessarily limited to: low cup to disc ratio (“crowded disc”), age over 50, diabetes, hypertension, coronary artery disease, hyperlipidemia and smoking. It is not possible to determine whether these events are related directly to the use of PDE5 inhibitors, to the patient's underlying vascular risk factors or anatomical defects, to a combination of these factors, or to other factors. Consistent with its known effects on the nitric oxide/cGMP pathway, Viagra was shown to potentiate the hypotensive effects of nitrates.

Sildenafil may cause side effects. Tell your doctor if any of these symptoms are severe or do not go away:

When Viagra is co-administered with an alpha-blocker, patients should be stable on alpha-blocker therapy prior to initiating Viagra treatment and Viagra should be initiated at the lowest dose. When Viagra 100 mg was co-administered with amlodipine (5 mg or 10 mg) to hypertensive patients, the mean additional reduction on supine blood pressure was 8 mmHg systolic and 7 mmHg diastolic. It is therefore recommended not to exceed a maximum single dose of 25 mg of Viagra in a 48 hour period. A starting dose of 25 mg of Viagra should be considered in patients taking erythromycin or strong CYP3A4 inhibitors (such as saquinavir, ketoconazole, itraconazole). In a drug-drug interaction study sildenafil 50 mg given with alcohol 0.5 g/kg in which mean maximum blood alcohol levels of 0.08% was achieved, sildenafil did not potentiate the hypotensive effect of alcohol in healthy volunteers. ED can also result from problems with blood flow into your penis. Viagra works to treat ED by helping you get and maintain an erection.

Viagra has helped millions of men regain sexual confidence.
The medication can be part of a broader approach to sexual health.
Proper dosing is vital to avoid adverse effects.
Always read the patient information leaflet thoroughly.
Be aware of potential interactions with other prescriptions.
Open communication with your doctor leads to better outcomes.

The drug does this by improving blood flow into your penis when you’re sexually aroused.

Generic versions of Viagra, containing sildenafil, are available in some markets.
The price of Viagra can vary depending on brand and dosage.
Using illicit or unregulated Viagra is risky and can be dangerous.
Viagra’s chemical formula is C22H30N6O4S.
It works by relaxing smooth muscle tissue in the penis.
Consultation with a doctor is essential before starting therapy.