British Library Course: Damaged books: first practical steps
Sudden hearing loss warning: This drug can cause hearing loss, tinnitus (ringing in your ears), or dizziness. If you have sudden hearing loss with or without tinnitus or dizziness, stop taking sildenafil and call your doctor right away. Use in children warning: Children generally should not take sildenafil; however, there are instances where the drug is considered the best treatment option. Talk with your child’s doctor to better understand the benefits and risks associated with this treatment option. Sildenafil oral tablet can interact with other medications, vitamins, or herbs you may be taking. An interaction is when a substance changes the way a drug works. This can be harmful or prevent the drug from working well. To help avoid interactions, your doctor should manage all of your medications carefully. Be sure to tell your doctor about all medications, vitamins, or herbs you’re taking. To find out how this drug might interact with something else you’re taking, talk with your doctor or pharmacist. Examples of drugs that can cause interactions with sildenafil are listed below. Do not take these drugs with sildenafil. Doing so can cause dangerous effects sildenafil cenforce in the body. Nitrates, such as isosorbide mononitrate, isosorbide dinitrate, or nitroglycerin.Taking these drugs with sildenafil can cause your blood pressure to drop suddenly to an unsafe level.
| Indication | Typical Dosage | Onset Time | Duration of Effect | Common Side Effects |
|---|---|---|---|---|
| Erectile Dysfunction | 5 mg once daily | 30-60 min | Up to 4 hours | Headache, flushing |
| Pulmonary Hypertension | 5 mg as prescribed | 15 min | 4-6 hours | Dizziness, nasal congestion |
| Off-label Use | Varies | Varies | Varies | Nausea, blurred vision |
Taking these drugs with sildenafil can cause your blood pressure to drop suddenly to an unsafe level.
Sildenafil Safety, Side Effects & Drug Interactions — What to Know Before You Buy Online
^ "MHRA reclassifies Viagra Connect tablets to a Pharmacy medicine". ^ "Viagra to be available without prescription in UK". All content on this page has been medically reviewed by: Hassan Thwaini, Clinical Pharmacist and Copywriter, Master of Pharmacy (MPharm) on 30 March, 2026. Sildenafil is an effective treatment for erectile dysfunction. It contains the same active ingredient as branded alternatives.
Using a mail-order pharmacy
Sildenafil works by encouraging more blood to flow to the penis, ensuring a strong erection when you need one. It’s effective for 82% of men.1 Find the clinically proven ED treatment that suits you best. No names, no logos, no delivery fee. 4.6* from over 33,000 people like you. BSc (Hons) MBBS MRCGP AFHEA MA (Hons) AFMCP “Efficacy and Safety of Sildenafil Citrate for Treatment of Erectile Dysfunction in a Population With Associated Organic Risk Factors.” Journal of Andrology (2013).
Can you buy Viagra over the counter?
“Efficacy and Safety of Sildenafil Citrate for Treatment of Erectile Dysfunction in a Population With Associated Organic Risk Factors.” Journal of Andrology (2013). Answer a few simple questions to get the treatment you need. Sildenafil oral tablet is available as a brand-name drug and as a generic drug. Sildenafil comes in three forms: an oral tablet, an oral suspension (liquid), and an injection that’s only given by a doctor. Sildenafil oral tablet is used to treat erectile dysfunction (ED). Guanylate cyclase stimulators, such as riociguat.Taking these drugs with sildenafil can cause your blood pressure to drop suddenly to an unsafe level. Side effects from sildenafil: Taking sildenafil with certain medications raises your risk for side effects from sildenafil. This is because the amount of sildenafil in your body is increased. HIV drugs, such as ritonavir, indinavir, saquinavir, or atazanavir.Increased side effects can include low blood pressure, dizziness, or vision problems.
| Product | Dosage | Quantity + Bonus | Price | |
|---|---|---|---|---|
| Viagra Generic | 100mg | 10 Pills | 28.91€ 27.53€ | |
| Kamagra Polo | 100mg | 180 + 8 Pills | 446.52€ 425.26€ | |
| Viagra Generic | 200mg | 90 + 6 Pills | 170.79€ 162.66€ | |
| Viagra Generic | 200mg | 20 Pills | 61.69€ 58.75€ | |
| Kamagra Polo | 100mg | 272 + 12 Pills | 622.94€ 593.28€ | |
| Viagra Generic | 25mg | 90 + 6 Pills | 105.03€ 100.03€ | |
| Kamagra Polo | 100mg | 12 Pills | 60.21€ 57.34€ | |
| Kamagra Oral Jelly | 100mg | 30 + 5 Sachets | 136.20€ 129.71€ | |
| Viagra Generic | 200mg | 30 + 2 Pills | 83.07€ 79.11€ | |
| Viagra Generic | 50mg | 180 + 8 Pills | 158.82€ 151.26€ | |
| Viagra Generic | 50mg | 360 + 10 Pills | 225.33€ 214.60€ | |
| Kamagra Oral Jelly | 100mg | 21 Sachets | 95.92€ 91.35€ | |
| Kamagra | 100mg | 360 + 6 Pills | 839.95€ 799.95€ | |
| Viagra Generic | 200mg | 270 + 10 Pills | 379.76€ 361.68€ | |
| Viagra Generic | 50mg | 20 Pills | 40.52€ 38.59€ | |
| Kamagra | 100mg | 180 + 6 Pills | 436.79€ 415.99€ |
They can also include erections that last longer than normal. Increased side effects can include low blood pressure, dizziness, or vision problems. Certain antibiotics, such as clarithromycin or erythromycin.Increased side effects can include low blood pressure, dizziness, or vision problems. Certain antifungals, such as ketoconazole or itraconazole.Increased side effects can include low blood pressure, dizziness, or vision problems.
How much is Viagra per pill?
If you have an erection that lasts more than 4 hours, call 911 or go to the nearest emergency room. If it’s not treated right away, this condition can cause permanent damage to your penis. Sudden vision loss warning: This drug can cause sudden vision loss in one or both eyes. This can be a sign of a serious eye problem. If this occurs, stop taking sildenafil and call your doctor right away. Side effects from other drugs: Taking sildenafil with certain medications raises your risk for side effects from these drugs.
- Sildenafil 5mg is a popular choice for initial trial.
- It’s important to follow the prescribed schedule.
- Online purchase requires caution and research.
- The medication’s effects can last several hours.
- Keep track of dosages and any side effects.
- Sildenafil 5mg is suitable for men with mild to moderate ED.
- Avoid taking more than the recommended dose.
- Pharmacist consultation can help determine the right dose.
- Sildenafil can be used with care in approved health conditions.
- The medication should be stored safely away from children.
- Check for compatibility with existing health conditions.
- Ensure purchase from licensed, reputable sources.
Alpha-blockers, such as terazosin, tamsulosin, doxazosin, alfuzosin, or silodosin.Increased side effects can include a drop in blood pressure, or fainting. Increased side effects can include a drop in blood pressure, or fainting. Blood pressure drugs, such as amlodipine.Increased side effects can include blood pressure that’s too low. Increased side effects can include blood pressure that’s too low.
| Retailer | Pack Size | Price | Delivery Time | Notes |
|---|---|---|---|---|
| PharmaShop | 30 tablets | $10 | 3-5 days | Bulk discounts available |
| MedExpress | 60 tablets | $18 | 4-6 days | Free shipping on orders over $20 |
| QuickMeds | 90 tablets | $24 | 2-4 days | Subscription options available |
| DiscountMeds | 30 tablets | $8 | 5-7 days | Cheapest option |
Other drugs for erectile dysfunction, such as avanafil, tadalafil, or vardenafil.Increased side effects can include low blood pressure or erections that last longer than normal Increased side effects can include low blood pressure or erections that last longer than normal Disclaimer: Our goal is to provide you with the most relevant and current information. However, because drugs interact differently in each person, we cannot guarantee that this information includes all possible interactions. This information is not a substitute for medical advice.
- The legal status of sildenafil varies worldwide.
- Beware of unlicensed sellers offering cheap generics.
- Oral tablets are the standard form of sildenafil.
- The drug helps relax smooth muscle tissue.
- 5mg doses are often used for initial treatment.
- Use of sildenafil requires understanding potential interactions.
- Common side effects include dizziness and nausea.
- Store sildenafil in a dry, dark place.
- Consult a healthcare provider for personalized advice.
- Do not share medication with others.
- Buying online can be convenient but risky without verification.
- Always prioritize safety and authenticity when purchasing.
Always speak with your healthcare provider about possible interactions with all prescription drugs, vitamins, herbs and supplements, and over-the-counter drugs that you are taking. Sildenafil can cause a severe allergic reaction. If you develop these symptoms, call 911 or go to the nearest emergency room.
Sildenafil prices
These drugs are often used to treat similar conditions. Sildenafil works in different ways, depending on the condition it’s being used to treat. For ED: Sildenafil works by increasing blood flow to the penis. This helps you get or maintain an erection. Sildenafil only works for ED if you’re sexually aroused.
What happens when you take Viagra for the first time?
For PAH: Sildenafil works by relaxing the muscles and sildenafil white opening up the blood vessels in your lungs. This decreases the blood pressure in your lungs. Sildenafil slows down the progression of your illness. It also makes you more able to exercise. Sildenafil can be used as early as 4 hours before sex and as late as 30 minutes before sex.
Pulmonary hypertension
However, it is recommended to use this drug within an hour before sex. Sildenafil should not be taken for ED more than once in a 24-hour period. But if you have certain medical conditions or are taking other drugs, your doctor may recommend that you take this drug less often than once a day. It is important to note that certain foods, particularly foods high in fat, can cause the drug to work more slowly than normal. Sildenafil oral tablet doesn’t cause drowsiness, but it can cause other side effects, including: flushing (reddening and warming of the face) an erection that lasts longer than normal If these effects are mild, they may go away within a few days or a couple of weeks. Don’t take this drug again if you’ve ever had an allergic reaction to it. Taking it again could be fatal (cause death). The use of drinks that contain alcohol raises your risk for low blood pressure from sildenafil. If you drink alcohol, talk with your doctor.
| Side Effect | Frequency | Severity | Common Causes | Recommendations |
|---|---|---|---|---|
| Headache | Common (30-40%) | Mild | Dehydration, stress | Hydrate, take with food |
| Flushing | Moderate (20%) | Mild to Moderate | Warm environment | Cool environment, avoid heat |
| Nasal Congestion | Less common | Mild | Vasodilation | Use decongestants |
| Dizziness | Occasional | Variable | Rapid standing, low BP | Sit or lie down, monitor BP |
You may need to have your blood pressure monitored while you take this drug. For people with heart problems: This drug can lower your blood pressure. If you’ve had certain heart problems in the last 6 months, ask your doctor whether this drug is safe for you.
Levitra vs. Viagra: which is stronger?
If they’re more severe or don’t go away, talk with your doctor or pharmacist. Call your doctor right away if you have serious side effects. Call 911 if your symptoms feel life threatening or if you think you’re having a medical emergency. Serious side effects and their symptoms can include the following: Symptoms can include:blurry visionconfusiondizzinessfaintinglightheadednessnausea or vomitingsleepinessweakness Increased shortness of breath or trouble breathing Priapism (an erection that lasts more than 4 hours) Symptoms can include:sudden vision loss in one or both eyes sudden vision loss in one or both eyes Symptoms can include:sudden hearing losstinnitus (ringing in your ears)dizziness Heart problems, such as heart attack, stroke, or irregular heart rate. Symptoms can include:chest painshortness of breathdizzinesstrouble speakingconfusionnausea or vomitingfeeling lightheaded Priapism warning: This drug can cause priapism, which is an erection that won’t go away. These problems include a heart attack, stroke, or life threatening heart rhythm problem. Also talk with your doctor if you have a low or high resting blood pressure, or a history of heart failure or coronary artery disease. For people with pulmonary veno-occlusive disease (PVOD): Taking this drug may worsen your heart function. For people with eye problems: This drug may cause sudden loss of vision in one or both eyes.
World Federation of Neurology
It’s also used to treat pulmonary arterial hypertension (PAH). It comes in the form of a tablet and suspension (liquid). It also comes in an intravenous (IV) form, which is only given by a doctor. Sildenafil oral tablet is available as the brand-name drugs Viagra and Revatio. It’s also available as a generic drug.
Why it’s used
Generic drugs usually cost less than the brand-name version. In some cases, they may not be available in every strength or form as the brand-name drug. Generic oral tablets are available for both conditions, but the brand-name drugs each treat only one of the conditions. Viagra: This drug is used to treat ED. With ED, you’re unable to get or maintain an erection.
Viagra and alcohol: do they interact?
Revatio: This drug is used to treat PAH. With PAH, the blood pressure in your lungs is too high. Your heart has to work very hard to pump blood into your lungs. Sildenafil belongs to a class of drugs called phosphodiesterase type 5 (PDE5) inhibitors. A class of drugs is a group of medications that work in a similar way. This may be a sign of non-arteritic anterior ischemic optic neuropathy (NAION). If you’ve already had NAION or have crowded optic disc, you may have a higher risk for NAION and vision changes with this drug.