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Viagra is a prescription-only drug that helps men with erectile dysfunction. It’s available from GPs, pharmacies and online, after a virtual consultation. But it’s important to remember that not all sellers are regulated and drugs from unauthorised outlets could be fake, ineffective or dangerous.
The NHS only prescribes viagra to men who have trouble getting or keeping an erection that lasts long enough for a satisfying sexual experience. This includes anyone assigned male at birth, but especially older men who may have a condition like strokes or dementia that affects their ability to get an erection, and people with genetic conditions that reduce blood flow or nerve signals to the penis.
To work, Viagra (sildenafil citrate) has to be taken an hour before sexual activity. It works by blocking an enzyme called phosphodiesterase type 5 (PDE5), which breaks down nitric oxide. Nitric oxide relaxes muscles and arteries in the penis, increasing blood flow to the area. It also prevents blood from clotting in the veins, so the erection stays firm.
Other drugs in this class are known as PDE5 inhibitors, including Cialis and Levitra. These aren’t as powerful or fast-acting as Viagra, but they can still help men with ED have an erection that lasts about four hours and is comfortable to maintain.
There are also natural and over-the-counter (OTC) ED medications that are sold in many shops and online. But, it’s important to remember that these products have not been tested or approved by the Food and Drug Administration, so they’re not guaranteed to be safe and effective.
비아그라 구매 사이트 from taking Viagra tend to be mild and go away on their own within a few hours. They can include headache, flushing, dizziness, drowsiness, vision changes, back pain and upset stomach. More serious side effects can also occur, but they’re usually rare and aren’t life-threatening. If you experience them, call your doctor or pharmacist right away.
If you take Viagra with nitrate medications, such as nitroglycerin, it can cause a sudden drop in your blood pressure. This can lead to chest pain and heart attack. It’s also not recommended to take Viagra with certain other medications, such as alpha-blockers and high blood pressure medicines.
Some people find that Viagra never works for them or that it loses its effectiveness over time, possibly because of changes in their health or diet. If this happens, you should talk to your GP about alternatives in the same drug class, such as tadalafil or vardenafil, and other treatments that can help with ED. It’s also worth asking your GP or sexual health clinic to refer you for a urology assessment to see if there’s an underlying cause. Often, this isn’t needed, but it can be useful for some men.
