The main ingredient in Viagra is sildenafil, meaning that the drugs are essentially the same.

In case of emergency/overdose

This could result in dangerous side effects. How to tell if the drug is working: For ED: You should be able to get and maintain an erection when sexually aroused. For PAH: You should be able to exercise more easily. Your doctor will also check you to determine if this drug is working. Keep these considerations in mind if your doctor prescribes sildenafil for you.

Pulmonary Arterial Hypertension

You can take this drug with or without food. You can cut or crush the tablet. When you take the drug depends on the condition being treated:For ED: You can take this drug at any time of day.For PAH: Take this drug three times per day about 4–6 hours apart. Take it at the same time every day. For ED: You can take this drug at any time of day. However, Viagra is marketed and prescribed strictly for erectile dysfunction, while generic sildenafil can be prescribed for PAH as well. Viagra is also known as “the little blue pill” because of its blue color, while generic sildenafil tends to be a white color.

Product	Dosage	Quantity + Bonus	Price
Viagra Generic	200mg	270 + 10 Pills	379.76€ 361.68€
Viagra Generic	100mg	270 + 10 Pills	270.47€ 257.59€
Viagra Generic	200mg	120 + 8 Pills	204.80€ 195.05€
Viagra Generic	50mg	270 + 8 Pills	198.48€ 189.03€
Viagra Generic	200mg	90 + 6 Pills	170.79€ 162.66€
Kamagra	100mg	60 + 4 Pills	201.34€ 191.75€
Viagra Generic	100mg	30 + 4 Pills	60.91€ 58.01€
Viagra Generic	50mg	60 + 4 Pills	83.93€ 79.93€
Kamagra Soft Tabs	100mg	180 + 8 Pills	425.45€ 405.19€
Kamagra Soft Tabs	100mg	60 + 4 Pills	180.59€ 171.99€
Viagra Generic	100mg	90 + 6 Pills	129.02€ 122.88€
Viagra Generic	50mg	20 Pills	40.52€ 38.59€
Viagra Generic	150mg	90 + 6 Pills	147.18€ 140.17€

Disclaimer: Healthline has made every effort to make certain that all information is factually correct, comprehensive, and up to date.

Usual Adult Dose for Erectile Dysfunction

This can help prevent levels of this drug from building up in your body. Typical dosage: 5 or 20 mg, taken three times per day about 4 to 6 hours apart Maximum dosage: 20 mg, taken three times per day about 4 to 6 hours apart This drug shouldn’t be used in children younger than 18 years of age. Disclaimer: Our goal is to provide you with the most relevant and current information. However, because drugs affect each person differently, we cannot guarantee that this list includes all possible dosages. Always speak with your doctor or pharmacist about dosages that are right for you.

Altitude sickness

Sildenafil oral tablet is used for short-term treatment of ED and long-term treatment of PAH. It comes with serious risks if you don’t take it as prescribed. If you stop taking the drug suddenly or don’t take it at all: For ED: Your ED symptoms won’t improve. For PAH: Your condition won’t improve and may get worse. Also, you won’t be able to exercise. However, this article should not be used as a substitute for the knowledge and expertise of a licensed healthcare professional. You should always consult your doctor or other healthcare professional before taking any medication. The drug information contained herein is subject to change and is not intended to cover all possible uses, directions, precautions, warnings, drug interactions, allergic reactions, or adverse effects.

Use Case	Description	Typical Dosage	Notes
Treatment of Erectile Dysfunction	Improves blood flow to the penis	20 mg as needed	Taken 30-60 minutes before sexual activity
Pulmonary Hypertension	To reduce blood pressure in lungs	20 mg thrice daily	Prescribed by doctor
Off-label Uses	Potential treatment for other conditions	Varies	Under medical supervision

The absence of warnings or other information for a given drug does not indicate that the drug or drug combination is safe, effective, or appropriate for all patients or all specific uses.

Brand Name	Price Range (per tablet)	Availability	Prescription Needed	Notes
Viagra	$2 - $5	Pharmacies	Yes	Brand-name option
Sildenafil generics	$0.50 - $1.50	Online & Local Pharmacies	Yes	Economical choice
Kamagra	Varies	Online (regulated in some countries)	Yes	Check legal status

Sildenafil is used to treat male sexual function problems (impotence or erectile dysfunction-ED).

Sildenafil was originally developed as a treatment for hypertension.
The 20 mg dose is considered a moderate dosage.
It can be part of a comprehensive erectile dysfunction treatment plan.
Regular use should be monitored by a healthcare professional.
The medication should not be used with other ED drugs simultaneously.

In combination with sexual stimulation, sildenafil works by increasing blood flow to the penis to help a man get and keep an erection. Sildenafil does not protect against sexually transmitted diseases (such as HIV, hepatitis B, gonorrhea, syphilis). Practice "safe sex" such as using latex condoms.

Usual Adult Dose for Pulmonary Hypertension

For PAH: Take this drug three times per day about 4–6 hours apart. Store sildenafil tablets at room temperature between 59°F and 86°F (15°C and 30°C). Don’t store this medication in moist or damp areas, such as bathrooms. A prescription for this medication is refillable. You should not need a new prescription for this medication to be refilled.

What should I do if I miss a dose of sildenafil?

Your doctor will write the number of refills authorized on your prescription. When flying, never put it into a checked bag. Keep it in your carry-on bag. Don’t worry about airport X-ray machines. You may need to show airport staff the pharmacy label for your medication. Consult your doctor or pharmacist for more details.

Why is this medication prescribed?

If you miss doses or don’t take the drug on schedule: For ED: Your ED symptoms won’t improve. For PAH: This medication may not work as well or may stop working completely. For this drug to work well, a certain amount needs to be in your body at all times. If you take too much: You could have dangerous levels of the drug in your body. Symptoms of an overdose of this drug can include: If you think you’ve taken too much of this drug, call your doctor or local poison control center.

Professional resources

If your symptoms are severe, call 911 or go to the nearest emergency room right away. What to do if you miss a dose: For ED: Take your dose 30 minutes to 4 hours before your next sexual activity. For PAH: Take your dose as soon as you remember. But if you remember just a few hours before your next scheduled dose, take only one dose. Never try to catch up by taking two doses at once. Sildenafil is also available in other brands and strengths for treating high blood pressure in the lungs (pulmonary hypertension).

Sildenafil 20 mg tablets are used primarily to treat erectile dysfunction.
They work by increasing blood flow to the penis.
Typically, the medication is taken 30-60 minutes before activity.
The effects of sildenafil can last up to 4-6 hours.
Do not take more than one tablet per day.

Do not take sildenafil with any other product that contains sildenafil or other similar medications for erectile dysfunction-ED or pulmonary hypertension (such as tadalafil, vardenafil).

Sildenafil 20 mg is one of several available dosages.
Be aware of potential side effects like dizziness and nausea.
Inform your doctor about any heart history before use.
Do not take sildenafil if you have recently had a stroke.
Follow instructions precisely to ensure safe and effective use.

Sildenafil is available under the following different brand names: Revatio, and Viagra. Dosage Considerations – Should be Given as Follows: 50 mg orally 1 hour before sexual activity may be increased to 100 mg or reduced to 25 mg, depending on effectiveness and tolerance Oral: 5 mg or 20 mg 3 times daily, administered 4-6 hours apart Intravenous (IV): 2.5-mg or 10-mg bolus 3 times daily if patient is temporarily unable to take orally Recommended oral/IV dose not to be exceeded Adding Revatio to bosentan does not have any beneficial effect on exercise capacity Hepatic impairment or severe renal impairment: Use initial dose of 25 mg Older than 65 years: 25 mg orally initially 1 hour before sexual activity Oral: 5 mg or 20 mg 3 times daily, administered 4-6 hours apart Intravenous (IV): 2.5-mg or 10-mg bolus 3 times daily if patient is temporarily unable to take orally Recommended oral/IV dose not to be exceeded Adding Revatio to bosentan does not have any beneficial effect on exercise capacity Clinical trials found no significant difference in response between elderly patients and younger adults; however, cautious dose selection should be considered in elderly because of greater frequency of decreased hepatic, renal, and cardiac function, as well as comorbid conditions and concomitant pharmacotherapy Compared with healthy younger volunteers, healthy elderly volunteers (65 years and older) had reduced clearance of sildenafil, resulting in approximately 84% and 107% higher plasma concentrations of sildenafil and its active N-desmethyl metabolite, respectively Not to be prescribed to children (1-17 years) for pulmonary arterial hypertension (PAH); this recommendation against use is based on long-term clinical pediatric trial showing that children taking high doses had higher risk of death than children taking low doses and that low doses were not effective in improving exercise ability Side effects associated with use of Sildenafil, include the following: Postmarketing side effects of sildenafil reported include: Vaso-occlusive crisis (PAH secondary to sickle-cell anemia) This document does not contain all possible side effects and others may occur.

5.8 Vaso-occlusive Crisis in Patients with Pulmonary Hypertension Secondary to Sickle Cell Anemia

If you are taking Revatio and you forget to take your scheduled dose, take it as soon as possible. However, you should never double your dosage. If you completely miss a dose and it’s time for the next dose, skip the one you missed. Are there any safety measures I should take before using this drug? Like most medications, there are precautions you should take before using this drug.

The Benefits of Sildenafil 20 mg Tablet

Make sure you talk with your doctor about: any other drugs, medications, herbs, or supplements you take or plan to take any medical conditions or surgeries you have or plan to have if you are pregnant or plan to become pregnant There are other drugs available to treat your condition. Some may be better suited for you than others. Talk with your doctor about other drug options that may work for you. Sildenafil and tadalafil are alike because they both can treat ED and PAH. However, tadalafil has a few distinctions from sildenafil. Check with your physician for additional information about side effects.

5.7 Priapism

Tadalafil is the generic name for the erectile dysfunction drug Cialis. There are two versions of the drug: a version that can be taken as needed Cialis 5-mg daily dosing is the only PDE5 inhibitor dose approved for treating an enlarged prostate; improving ED symptoms is an added benefit of the daily dose. Because of the “as needed” version of tadalafil, some users may find this option more convenient. The downside, however, is that side effects tend to last longer too. The main difference between generic sildenafil and Viagra is marketing. If your medical doctor is using this medicine to treat your pain, your doctor or pharmacist may already be aware of any possible drug interactions and may be monitoring you for them. Do not start, stop, or change the dosage of any medicine before checking with your doctor, health care provider or pharmacist first. Sildenafil has serious interactions with at least 48 different drugs.

Usual Geriatric Dose for Erectile Dysfunction

Always carry the original prescription-labeled container with you. Don’t put this medication in your car’s glove compartment or leave it in the car. Be sure to avoid doing this when the weather is very hot or very cold. If you’re taking this drug for PAH, your doctor may monitor your blood pressure and pulse regularly. When filling your prescription, be sure to call ahead to make sure your pharmacy carries it.

What’s the difference between sildenafil and Viagra?

Many insurance companies require prior authorization for this drug. This means your doctor may need to get approval from sildenafil 100g your insurance company before your insurance company will pay for the prescription. Sildenafil under the brand name Viagra is prescribed to treat erectile dysfunction by increasing blood flow to the penis during arousal. Sildenafil under the brand name Revatio is often prescribed to help adults with PAH get more exercise by treating their condition. What if I forget to take it?