Sildenafil might also be dangerous for people with a history of certain medical conditions, including: Allergic reactions to Viagra or any PDE5 inhibitor Allergic reactions to Viagra or any PDE5 inhibitor Blood problems like hemophilia, leukemia, or sickle cell anemia Blood problems like hemophilia, leukemia, or sickle cell anemia Conditions affecting penis shape, like Peyronie’s disease or a curved penis Conditions affecting penis shape, like Peyronie’s disease or a curved penis Eye problems, such as retinitis pigmentosa, vision loss, or NAION (non-arteritic anterior ischemic optic neuropathy) Eye problems, such as retinitis pigmentosa, vision loss, or NAION (non-arteritic anterior ischemic optic neuropathy) Heart problems (e.g., having had a heart attack or stroke) Heart problems (e.g., having had a heart attack or stroke) There are a few sildenafil drug interactions you need to look out for, too.
5.9 Vaso-occlusive Crisis in Patients with Pulmonary Hypertension Secondary to Sickle Cell Anemia
Sildenafil may also be used off-label to treat: Raynaud phenomenon (narrowing blood vessels in extremities such as fingers and toes) Raynaud phenomenon (narrowing blood vessels in extremities such as fingers and toes) Sildenafil has a variety of uses because it’s a phosphodiesterase type 5 (PDE5) inhibitor. PDE5 inhibitors are medications that improve blood flow to certain tissues by widening the blood vessels. They’re best known for increasing blood flow to the penis, allowing for erections upon sexual stimulation. At the moment, 20 mg Viagra does not exist — but you can get Revatio in a 20 mg tablet, and it can be prescribed off-label for ED. In the same way that you can get generic Viagra as a 25 mg sildenafil tablet, you can also get generic Revatio as a 20 mg sildenafil tablet.
Teva sildenafil pills are white, not blue
It may be marked as a c89 pill or described as generic Viagra because these drugs both contain sildenafil. The only chemical difference is the dosage. If you’re taking a 20 mg generic Viagra white pill, chances are you’re actually taking generic Revatio. Viagra is available in dosages of 25 mg, 50 mg, and 100 mg. Currently, 100 mg sildenafil is the highest dosage approved by the FDA.
What should I do if I miss a dose of sildenafil?
Revatio is available in 20 mg tablets. There’s no one-size-fits-all solution when it comes to the ideal sildenafil dosage. Your dosage will depend on your health needs and the reason you’re taking the medication. You might assume a higher dosage of sildenafil leads to a firmer erection or better sex, but this isn’t always the case. In fact, taking too much sildenafil can lead to some serious side effects, like a sudden decrease in blood pressure. An interaction is when one drug, like sildenafil, causes a negative reaction when mixed with another medication, supplement, or substance. Other PDE5 inhibitors, including erectile dysfunction medications like tadalafil (Cialis), avanafil (Stendra®), or vardenafil (Levitra or Staxyn®) Other PDE5 inhibitors, including erectile dysfunction medications like tadalafil (Cialis), avanafil (Stendra®), or vardenafil (Levitra or Staxyn®) Nitrates for angina (chest pain), such as nitroglycerin (Nitrostat® or NitroMist®), isosorbide mononitrate, and isosorbide dinitrate (Isordil®) Nitrates for angina (chest pain), such as nitroglycerin (Nitrostat® or NitroMist®), isosorbide mononitrate, and isosorbide dinitrate (Isordil®) Sildenafil may also have minor interactions with the following substances: Certain antifungal drugs, such as ketoconazole and itraconazole Certain antifungal drugs, such as ketoconazole and itraconazole Some antibiotics, like erythromycin and clarithromycin (Biaxin®) Some antibiotics, like erythromycin and clarithromycin (Biaxin®) HIV protease inhibitors, like saquinavir mesylate (Invirase®) and ritonavir (Norvir®) HIV protease inhibitors, like saquinavir mesylate (Invirase®) and ritonavir (Norvir®) If you’ve been prescribed any of the above medications, it’s a good idea to ask a healthcare professional whether you can safely take them with sildenafil.
| Brand Name | Manufacturer | Dosage | Market Region | Price Range (USD) | Packaging Options |
|---|---|---|---|---|---|
| Viagra | Pfizer | 50 mg | Global | 10-20 per pill | Blister pack of 4-12 pills |
| Revatio | Pfizer | 20 mg | Global | 15-25 per pill | Blister pack of 30 pills |
| Kamagra | Ajanta Pharma | 50 mg | India, SE Asia | 2-5 per pill | Varies (blister) |
| Sildenafil Original | Local Pharmacies | 50 mg | Local Markets | 12-18 per pill | Bottle/Blister |
Also, while you can mix Viagra with alcohol, it’s a good idea to pace yourself and only have one or two drinks.
| Product | Dosage | Quantity + Bonus | Price | |
|---|---|---|---|---|
| Kamagra Polo | 100mg | 84 + 4 Pills | 244.49€ 232.85€ | |
| Viagra Generic | 150mg | 270 + 10 Pills | 326.61€ 311.06€ | |
| Viagra Generic | 200mg | 10 Pills | 40.96€ 39.01€ | |
| Kamagra Oral Jelly | 100mg | 63 + 7 Sachets | 224.18€ 213.50€ | |
| Kamagra Soft Tabs | 100mg | 20 Pills | 79.79€ 75.99€ | |
| Viagra Generic | 200mg | 90 + 6 Pills | 170.79€ 162.66€ | |
| Viagra Generic | 100mg | 120 + 6 Pills | 149.50€ 142.38€ | |
| Viagra Generic | 150mg | 60 + 4 Pills | 111.25€ 105.95€ | |
| Viagra Generic | 100mg | 30 + 4 Pills | 60.91€ 58.01€ | |
| Viagra Generic | 150mg | 90 + 6 Pills | 147.18€ 140.17€ |
Erectile dysfunction is just one condition sildenafil can help address.
- Sildenafil is classified as a prescription medication in most countries.
- Proper diagnosis of ED by a doctor is essential before using sildenafil.
- Sildenafil’s primary function is to facilitate normal erectile response.
- The drug's onset of action can vary among individuals.
- White sildenafil tablets are sometimes found in counterfeit markets.
- It’s advisable to start with the lowest effective dose.
- Some patients report a “refractory” period after taking sildenafil.
- Sildenafil should not be used with certain recreational drugs like poppers.
- The medication’s safety profile is well-understood when used correctly.
- Inform your healthcare provider if you experience prolonged erections.
- Keep an updated record of all medications while using sildenafil.
The dosage of sildenafil you use will depend on whether you’re taking it for ED, a cardiovascular condition, or for another reason.
| Side Effect | Incidence Rate | Severity | Commonality | Notes |
|---|---|---|---|---|
| Headache | High | Mild to moderate | Common | Usually resolves quickly |
| Flushing | Moderate | Mild | Common | Reddening of face and neck |
| Dizziness | Moderate | Mild to moderate | Common | Especially when standing up quickly |
| Vision Changes | Low | Mild to moderate | Less common | Blurred vision or light sensitivity |
A 20 mg dose of sildenafil is FDA-approved for pulmonary arterial hypertension.
- The legality of purchasing sildenafil varies by country.
- Online pharmacies may offer sildenafil, but verify their legitimacy.
- White sildenafil tablets are designed for rapid dissolution in the mouth or swallowing.
- Be aware of potential allergic reactions, such as rash or swelling.
- Avoid taking sildenafil with large meals that contain high fat content.
- The effectiveness of sildenafil depends on individual health conditions.
- The American Urological Association provides guidelines on sildenafil use.
- Sildenafil can cause safety concerns in patients with low blood pressure.
- The drug works best when taken approximately one hour before intimacy.
- Use sildenafil solely as directed; misuse can lead to health risks.
- Regular check-ups can help monitor the impact of sildenafil on health.
That said, it is sometimes prescribed off-label (at the 20 mg dose and at multiples of 20 mg, including 40 mg, 60 mg, 80 mg, and 100 mg) for ED.
| Country/Region | Legal Status | Regulatory Agency | Prescription Needed | Notes |
|---|---|---|---|---|
| United States | Prescription-only | FDA | Yes | Class II controlled substance |
| European Union | Prescription-required | EMA | Yes | Regulated as prescription drug |
| India | Available both OTC and RX | CDSCO | Prescription recommended | Varies by state |
| Australia | Prescription-only | TGA | Yes | Controlled medicine |
If you’re wondering How many 20 mg sildenafil should I take for ED?, that’s for you and your provider to figure out.
How it works
Keep this medication in the container it came in, tightly closed, and out of reach of children. Store the tablets at room temperature and away from excess heat and moisture (not in the bathroom). Store the suspension at room temperature or in a refrigerator, but do not freeze it. Dispose of any unused suspension after 60 days. Keep all medication out of sight and reach of children as many containers are not child-resistant.
Marketing and sales
Place the medication in a safe location – one that is up and away and out of their sight and reach. Dispose of unneeded medications in a way so that pets, children, and other people cannot take them. Do not flush this medication down the toilet. Talk to your pharmacist about take-back programs in your community. Visit the FDA's Safe Disposal of Medicines website for more information.
Sildenafil side effects
In case of overdose, call the poison control helpline at 1-800-222-1222. Information is also available online at If the victim has collapsed, had a seizure, has trouble breathing, or can't be awakened, immediately call emergency services at 911. Do not let anyone else take your medication. Ask your pharmacist any questions you have about refilling your prescription. Keep a written list of all of the prescription and nonprescription (over-the-counter) medicines, vitamins, minerals, and dietary supplements you are taking. For ED, the typical starting sildenafil dosage is 50 mg.
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It’s best to stick with your prescribed dosage and follow the patient information leaflet your healthcare provider gives you. If you find that a particular dose isn’t working as well as you had hoped, make another appointment with your provider and ask if you can revisit your dosage or explore other treatment options. To get the best results from Viagra, it’s important to take the right dosage. As mentioned, 20 mg sildenafil is FDA-approved for pulmonary arterial hypertension, not erectile dysfunction. If you take a 20 mg dose of sildenafil, it sildenafil 50 mg tab might improve your erections, but it might not.
Does sildenafil interact with foods or drinks?
Although Viagra can come in as small a dose as 25 mg, the 50 mg tablets are usually the starting dosage. If you experience uncomfortable side effects, your dosage could decrease to 25 mg. Patients older than 65 and those with kidney or liver problems may start on a 25 mg dose. Viagra is considered an effective treatment for erectile dysfunction, but its efficacy depends on the dosage. In clinical trials, 63 percent of participants who took 25 mg sildenafil reported an improvement in their erections, compared to 74 percent of those who took 50 mg and 82 percent of those who took 100 mg.
How it works
With that said, other erectile dysfunction treatments — like tadalafil (Cialis®) and vardenafil (Levitra®) — are available in a 20 mg dosage, but these are different medications, so their dosages aren’t directly comparable to sildenafil. Whether you’re experiencing poor erectile function or have a cardiovascular condition, sildenafil can drastically improve your symptoms. The medication is generally safe, and research suggests it won’t cause any long-term health issues. But that doesn’t mean it’s completely without risks or side effects. If you experience priapism (a prolonged, painful erection) or any other serious adverse effects — like shortness of breath, irregular heartbeat, or loss of vision — seek emergency medical attention. Though it can be increased or decreased as needed, licensed prescribers usually start patients on a 50 mg tablet.
- Sildenafil tablets are usually small, oval-shaped, and white in color.
- Their availability depends on your country’s healthcare regulations.
- Sildenafil's impact varies based on diet, health, and alcohol use.
- Follow all instructions regarding dose timing for optimal results.
- Always store sildenafil out of direct sunlight and moisture.
- Consult a healthcare professional if sildenafil fails to produce desired effects.
- Do not skip doses if you miss a scheduled dose; consult your doctor.
- Sildenafil is not a cure but helps manage symptoms of ED.
- Be aware of the potential for a drop in blood pressure post-dose.
- Use sildenafil responsibly to prevent side effects and interactions.
- Always verify that the medication is prescribed specifically for you.
If the side effects of sildenafil are putting you off, or if it’s just not working as well as you’d hoped, you may want to look into tadalafil (Cialis), Stendra (avanafil), or our chewable ED hard mints. Our guide on how to take sildenafil for erectile dysfunction covers some need-to-know information about Viagra, but it’s no replacement for speaking with a licensed healthcare professional.
- Sildenafil tablets are not intended for recreational use or performance enhancement.
- Always follow a healthcare provider’s instructions for safe use.
- Sildenafil’s effects last for a few hours, depending on individual factors.
- The medication is taken as needed, not as a daily supplement.
- Only use sildenafil under medical supervision if you have heart disease.
- Do not take sildenafil if you are allergic to sildenafil citrate.
- The drug helps improve quality of life for men with ED.
- Sildenafil may cause temporary visual disturbances, like a blue tint.
- Proper hydration can help minimize side effects.
- Certain genetic conditions may affect sildenafil's effectiveness.
- Regular medical reviews ensure safe long-term use of sildenafil.
If you’re concerned about your sildenafil dosage or experiencing uncomfortable side effects, you should seek medical advice from a healthcare professional.
2.2 Use with Food
Bring this list with you each time you visit a doctor or if you are admitted to the hospital. You should carry the list with you in case of emergencies. Be ready for sex whenever you're in the mood When it comes to penises, size isn’t everything. But when it comes to erectile dysfunction (ED) medications, dose size can make a difference. Sildenafil citrate is a generic drug found in several types of prescription meds.
Why it’s used
It’s most popularly known as the active ingredient in Viagra® and a treatment for ED, but sildenafil is also sold as Revatio®, a medication marketed for treating pulmonary arterial hypertension. Depending on your health needs, your dosage of Viagra might be 25 milligrams (mg), 50 mg, or 100 mg. While sildenafil 20 mg tablets do exist, they’re FDA-approved for pulmonary arterial hypertension, not ED. Keep reading to find out if a sildenafil 20 mg dosage for erectile dysfunction exists, the most common sildenafil dosages, potential side effects, and more. Most people assume they sildenafil tablet manforce 50 mg know what Viagra does — it causes erections, right?
Jet lag research
While this is true, a few uses of sildenafil extend beyond improving sexual activity. Besides being sold as Viagra, sildenafil is the active ingredient in Revatio. As we mentioned above, this brand-name drug is approved by the U.S. Food and Drug Administration (FDA) for treating pulmonary hypertension, a type of high blood pressure affecting arteries in the lungs and the right side of the heart. Revatio can prevent this condition from worsening.