Mechanism of Action and Pharmacodynamics

In addition, sildenafil also comes as 20-mg tablets, an oral liquid suspension, and a solution given by injection.

StatPearls [Internet].

These symptoms include needing to pass urine frequently or urgently. They can also include having a weak flow of urine or being unable to fully empty your bladder. Viagra and Cialis both come as tablets that you take by mouth. With Viagra, you’ll take the drug between 30 minutes and 4 hours before you plan to have sex. The medication can help you get an erection up to 4 hours after you’ve taken a dose.

What does Viagra do for ED?

Viagra shouldn’t be taken more than once a day. With Cialis, you’ll take a dose at least 30 minutes before you plan to have sex. This medication can help you get an erection up to 36 hours after you’ve taken a dose. Cialis shouldn’t be taken more than once a day. While you can take Cialis just as needed for ED treatment, another option is to take a low dose of the drug regularly each day. These forms of sildenafil are generic versions of a brand-name drug called Revatio. But unlike Viagra, they’re not used to treat ED. Revatio and these forms of sildenafil are used to treat pulmonary arterial hypertension (PAH). With PAH, you have high blood pressure in the artery between your heart and lungs. This means that generic sildenafil is just as effective in treating ED as Viagra is when it’s taken at the same doses as Viagra. It also means that sildenafil and Viagra can cause the same side effects. For information on the possible side effects of Viagra, see the “Viagra side effects” section. The actual price you’ll pay for either drug depends on your insurance plan, your location, and your prescribed dosage. Like Cialis (described above), Levitra is also prescribed for similar uses as Viagra.

Product	Dosage	Quantity + Bonus	Price
Viagra Generic	25mg	90 + 6 Pills	105.03€ 100.03€	Buy
Kamagra Oral Jelly	100mg	10 Sachets	54.55€ 51.95€	Buy
Viagra Generic	50mg	90 + 6 Pills	107.37€ 102.26€	Buy
Viagra Generic	25mg	20 Pills	37.74€ 35.94€	Buy
Viagra Generic	150mg	180 + 10 Pills	236.46€ 225.20€	Buy
Kamagra Polo	100mg	12 Pills	60.21€ 57.34€	Buy
Kamagra	100mg	60 + 4 Pills	201.34€ 191.75€	Buy
Kamagra Polo	100mg	272 + 12 Pills	622.94€ 593.28€	Buy
Viagra Generic	50mg	180 + 8 Pills	158.82€ 151.26€	Buy
Kamagra Soft Tabs	100mg	180 + 8 Pills	425.45€ 405.19€	Buy
Kamagra Polo	100mg	120 + 6 Pills	327.15€ 311.57€	Buy
Viagra Generic	150mg	30 + 2 Pills	72.32€ 68.88€	Buy
Viagra Generic	150mg	270 + 10 Pills	326.61€ 311.06€	Buy
Viagra Generic	25mg	270 + 8 Pills	184.26€ 175.49€	Buy
Viagra Generic	50mg	20 Pills	40.52€ 38.59€	Buy
Kamagra Polo	100mg	84 + 4 Pills	244.49€ 232.85€	Buy
Kamagra	100mg	12 Pills	55.64€ 52.99€	Buy

Here we look at how Viagra and Levitra are alike and different. The brand-name form of Levitra was discontinued in 2021.

Side Effect	Severity	Common Symptoms	Frequency
Headache	Mild to Moderate	Throbbing pain, sensation of pressure	Very common
Flushing	Mild	Skin redness, warmth	Common
Dyspepsia (Indigestion)	Mild	Burning sensation in stomach	Common
Visual disturbances	Mild to moderate	Blue tint, blurred vision	Less common
Priapism	Severe	Prolonged and painful erection	Rare

However, the active drug in Levitra is available as a generic medication called vardenafil. The generic form has the same use, dosage, safety, and effectiveness as the brand-name drug. The information about Levitra in this article also applies to vardenafil unless otherwise noted. Viagra contains the drug sildenafil, while Levitra contains the drug vardenafil.

What special dietary instructions should I follow?

Here we look at how Viagra and sildenafil are alike and different. Viagra, which contains the active drug sildenafil, is a brand-name drug. But sildenafil is also available as a generic medication. A generic medication is an exact copy of the active drug in a brand-name medication. The Food and Drug Administration (FDA) considers generics to be just as safe and effective as the original drug.

Warnings for people with certain health conditions

Generics tend to cost less than brand-name drugs. Viagra is approved to treat ED in males ages 18 years and older. It comes as tablets that you take by mouth. Viagra is available in the following strengths: Like Viagra, certain forms of sildenafil 20 mg prescription sildenafil are approved to treat ED in males ages 18 years and older. For example, sildenafil 25-mg, 50-mg, and 100-mg tablets are approved for this use. Both Viagra and Levitra belong to a group of drugs called phosphodiesterase type 5 (PDE5) inhibitors. Viagra and Levitra are both approved to treat erectile dysfunction (ED) in males ages 18 years and older. Viagra and Levitra both come as tablets that you take by mouth. With Viagra, you’ll take a dose between 30 minutes and 4 hours before you plan to have sex. With Levitra, you’ll take a dose about 1 hour before sexual activity. The medications can help you get an erection up to 4 hours after you take a dose. But neither drug should be taken more than once a day.

• Sildenafil is available in most countries through prescription only.
• It is used worldwide, with varying approval statuses.
• FDA and EMA have rigorous testing standards for sildenafil.
• Using the drug responsibly can lead to successful treatment outcomes.
• Combining sildenafil with other medications requires medical supervision.
• Be aware of the potential for drug interactions with heart or blood pressure meds.
• Always consult a healthcare professional for personalized advice.

Viagra and Levitra both contain the same type of drug. These lists contain up to 10 of the most common mild side effects that can occur with Viagra, with Levitra, or with both drugs (when taken individually).

• Sildenafil is unsuitable for individuals with severe liver disease.
• Patients should avoid alcohol consumption during treatment.
• Some side effects may resolve on their own within hours.
• Persistent side effects should prompt medical consultation.
• The drug does not cure ED but manages symptoms.
• Lifestyle changes can also improve erectile function.
• Follow your healthcare provider’s instructions precisely.

Can occur with Viagra:mild and temporary vision changes, such as a blue tinge to your vision, blurred vision, or sensitivity to lightrashmuscle pain mild and temporary vision changes, such as a blue tinge to your vision, blurred vision, or sensitivity to light Can occur with Levitra:sinusitis (inflammation in your sinuses)flu-like symptoms, such as fever, chills, and body aches flu-like symptoms, such as fever, chills, and body aches Can occur with both Viagra and Levitra:headacheflushingindigestionnasal congestion (stuffy nose)nauseadizzinessback pain The following list contains examples of serious side effects that can occur with either Viagra or Levitra. priapism (long-lasting and sometimes painful erection) non-arteritic anterior ischemic optic neuropathy (NAION), which is an eye condition that causes damage to your optic nerve low blood pressure, if the drugs are taken with certain other medications cardiovascular problems, such as heart attack, irregular heartbeat, and stroke, all of which occur mainly in people with heart disease The only condition both Viagra and Levitra are used to treat is ED. The use of Viagra and Levitra in treating ED has been directly compared in several clinical studies and compared in several reviews of studies. Based on study information, the American Urological Association considers Viagra and Levitra to be similarly effective in improving the ability of males to get and maintain erections. Viagra and Levitra are both brand-name drugs.

Dosage And Administration

Doing this can help you to get an erection at any time when you’re sexually aroused. This may help make sex more spontaneous for you. Viagra and Cialis both contain the same type of drug. Therefore, these medications can cause very similar side effects. Below are examples of these side effects.

Vitamin K Antagonists

These lists contain up to 10 of the most common mild side effects that can occur with Viagra, with Cialis, or with both drugs (when taken individually). Can occur with Viagra:mild and temporary vision changes, such as a blue tinge to your vision, blurred vision, or sensitivity to lightnauseadizzinessrash mild and temporary vision changes, such as a blue tinge to your vision, blurred vision, or sensitivity to light Can occur with Cialis:pain in your arms or legsupper respiratory tract infectioncoughdiarrhea Can occur with both Viagra and Cialis:headacheflushingindigestionnasal congestion (stuffy nose)back painmuscle pain The following list contains examples of serious side effects that can occur with either Viagra or Cialis. priapism (long-lasting and sometimes painful erection) non-arteritic anterior ischemic optic neuropathy (NAION), which is an eye condition that causes damage to your optic nerve low blood pressure, if the drugs are taken with certain other medications cardiovascular problems, such as heart attack, irregular heartbeat, and stroke, all of which mainly occur in people with heart disease Viagra and Cialis have different approved uses, but they’re both used to treat ED. The use of Viagra and Cialis in treating ED has been directly compared in several clinical studies. One review of these studies found the two drugs were similarly effective in improving the ability of males to have and maintain erections. The actual price you’ll pay for either drug depends on your insurance plan, your location, and the pharmacy you use. Here are answers to some frequently asked questions about Viagra. No, studies haven’t shown that Viagra makes sex last longer. However, the drug can help you to get and keep an erection. And studies have shown that Viagra can increase satisfaction from sex. No, Viagra doesn’t increase the size of a male’s penis.

Country	Approval Status	Regulatory Agency	Notes
USA	Approved	FDA	For ED and pulmonary hypertension
European Union	Approved	EMA	Similar indications
India	Approved	CDSCO	Generic versions available
Australia	Approved	TGA	Prescription required

There aren’t any known ways to permanently increase the size of a penis. Viagra helps you get an erection if you’re sexually aroused. This may temporarily increase the size of your penis, until the erection goes away. But Viagra doesn’t permanently increase the size of your penis. Yes, Viagra is generally considered safe to use if: it’s been prescribed by a doctor who knows your medical history, and you’re taking the drug as directed Viagra’s safety has been shown in several clinical studies. The drug does have a few serious side effects, but these rarely occur. For more information about the side effects of Viagra, see the section “Viagra side effects” above.

Patient Counseling Information

However, researchers found that people who took Cialis had improved confidence in their sexual ability. So, the people were more likely to prefer Cialis over Viagra. This is likely due to the long-lasting effect of Cialis, which allows people to have more spontaneous sex. (Cialis’s dosing schedule allows less planning for when you need to take a dose before having sex.) The study also found that males who took Cialis were more likely to have back or muscle pain than those taking Viagra. But people taking Cialis were less likely to have flushing compared with those taking Viagra.

Full Text Sources

Viagra and Cialis are both brand-name drugs. Generic forms of both drugs are available. Brand-name medications usually cost more than generics. The actual price you’ll pay for either drug depends on your insurance plan, your location, your prescribed dosage, and the pharmacy you use. In addition to being available as the brand-name drug Viagra, it’s available as a generic drug. However, Viagra may not be safe to use if you have certain medical conditions, including heart disease. And it’s not safe to use Viagra if you’re taking certain other medications, such as nitrates. (Nitrates are sometimes used to treat chest pain that’s related to heart problems.) This is why you should only take Viagra if it’s been prescribed by a doctor who knows your medical history. For more information about conditions that may make it unsafe for you to take Viagra , see the “Viagra precautions” section. And for more information about taking other medications with Viagra, see the “Viagra interactions” section. That depends on how high your blood pressure is. For example, if you have high blood pressure that’s not managed, your heart may not be healthy enough for sexual activity. (With unmanaged high blood pressure, your blood pressure is greater than 170/110 mmHg.) If this is the case, talk with your doctor about whether Viagra is safe for you.

• Sildenafil citrate is manufactured by several pharmaceutical companies.
• Its chemical formula is C22H30N6O4S.
• It has a half-life of approximately 4 hours in the body.
• The drug enhances nitric oxide activity in the corpus cavernosum.
• It’s important to follow prescribed dosing to avoid adverse effects.
• It is classified as a phosphodiesterase type 5 inhibitor.
• Sildenafil was initially researched for angina before ED use.