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Serious side effects are rare and happen in less than 1 in 1,000 people.

Stop taking sildenafil and call a doctor straight away if you get : chest pains - if this happens during or after sex, get into a semi-sitting position and try to relax; do not use nitrates to treat your chest pain prolonged and sometimes painful erections - if you have an erection that lasts for more than 4 hours, contact a doctor immediately a sudden decrease or loss of vision a serious skin reaction - symptoms may include fever, severe peeling and swelling of the skin, blistering of the mouth, genitals and around the eyes seizures.

In rare cases, it's possible to have a serious allergic reaction (anaphylaxis) to sildenafil. Immediate action required: Call 999 or go to A&E if: you get a skin rash that may include itchy, red, swollen, blistered or peeling skin you're wheezing you get tightness in the chest or throat you have trouble breathing or talking your mouth, face, lips, tongue or throat start swelling. You could be having a serious allergic reaction and may need immediate treatment in hospital.

For a full list, see the leaflet inside your medicines packet. You can report any suspected side effect to the UK safety scheme.

Sildenafil is not recommended in pregnancy and while breastfeeding.

Non-urgent advice: Tell your doctor if you're: trying to get pregnant pregnant breastfeeding. Tell your doctor if you're taking these medicines before you start sildenafil : nitrates for chest pain riociguat for pulmonary hypertension recreational drugs called poppers, such as amyl nitrite.

Mixing sildenafil with herbal remedies and supplements. Some complementary therapies may have ingredients that could interfere with sildenafil and cause side effects. Tell your doctor or pharmacist if you're taking any other medicines, including herbal remedies, vitamins or supplements.

Sildenafil belongs to a group of medicines called phosphodiesterase 5 (PDE5) inhibitors.

It works if you have erection problems by temporarily increasing blood flow to the penis when you get sexually excited. It works in pulmonary hypertension by relaxing blood vessels in the chest. This increases the blood supply to the lungs and reduces the workload of the heart. In general, at least two-thirds of men say they have harder erections after taking it.

If sildenafil does not work for you, it may be because: you have not waited long enough after taking it before trying to have sex you have waited too long after taking it to have sex the dose is not high enough you're not sexually aroused enough.

Sildenafil usually starts to work within 30 to 60 minutes.

It's triggered by sexual stimulation, so you need to be aroused for it to work.

You should be able to get an erection at any time between 1 and 4 hours after taking sildenafil. Your erection should go away after you have had sex.

If you're taking sildenafil for erectile dysfunction, do not take it more than once a day. If you're taking sildenafil (Revatio) for pulmonary hypertension, do not take it more than 3 times a day.

There do not seem to be any lasting harmful effects from taking it for many months and years.

If sildenafil does not work, there are other tablets you could try that work in a similar way, such as: tadalafil (Cialis) - can be taken up to 36 hours before sex avanafil (Spedra) - can be taken up to around 4 hours before sex vardenafil (Levitra) - can be taken up to around 4 hours before sex. This is a man-made hormone that helps to stimulate blood flow to the penis. Alprostadil comes as: an injection directly into your penis a small pellet placed inside your urethra (the tube that carries urine from your bladder to the tip of your penis) If you cannot get erections because of a hormonal problem, your GP may refer you to an endocrinologist (who specialises in the treatment of hormonal problems).

You may benefit from treatment using injections of man-made hormones to restore your hormone levels to normal. Other treatments for erectile dysfunction include: a vacuum pump psychological treatments

penile

There's no good evidence that sildenafil works for women with sexual problems.

There's no firm evidence to suggest that taking sildenafil will reduce fertility in either women or men.

But speak to a pharmacist or your doctor before taking it if you're trying to get pregnant. Sildenafil does sildenafil citrate tablets buy online not affect any type of contraception, including the contraceptive pill and emergency contraception. A beer or a couple of glasses of wine are not likely to stop or delay sildenafil working. But drinking lots of alcohol can make it more difficult to get an erection. To get the most benefit from sildenafil, do not drink heavily before taking it.

Taking poppers (amyl nitrite) with sildenafil can have a dangerous effect on your heart.

It can also be potentially dangerous to take sildenafil with: stimulants like MDMA (ecstasy) or cocaine hallucinogens like LSD novel psychoactive substances (which used to be known as legal highs) like mephedrone.

Sildenafil has not been properly tested with recreational drugs.

Talk to your doctor if you think you might use any recreational drugs with sildenafil.

Do not drink online generic viagra grapefruit juice if you're taking sildenafil (Revatio) for pulmonary hypertension. You can eat and drink normally while taking sildenafil (Viagra) to get an erection.

Erectile dysfunction can often be improved if you make changes to your lifestyle, such as: Related conditions.

Ejaculation problems Erectile dysfunction (impotence) Male sexual problems Priapism (painful erections) Pulmonary hypertension.

Relate (sex therapy): charity Sexual Advice Association: charity Sildenafil: forum Viagra: forum.

Page last reviewed: 22 January 2019 Next review due: 22 January 2022. Posted on 16 May 2016 24 October 2019 by Dr Tony Steele - Dr Fox is a CQC , GPhC , & MHRA regulated service.

Both Viagra and sildenafil are widely used to treat erectile dysfunction. Viagra is a brand name for the sildenafil produced and sold by the company Pfizer. Sildenafil is also sold as a generic drug, which is medically identical to Viagra. Sildenafil citrate was created in 1989 by British scientists Albert Wood and Peter Dunn as a possible treatment for hypertension and angina; conditions associated with coronary heart disease. Nicholas Terrett, now often referred to as the father of Viagra, was named in the British patent for the drug as a heart medication. And though Pfizer’s early trials of the drug in the 1990s did not prove its efficacy as a heart medication, patients who took part in the clinical trials reported increased erections after taking sildenafil. Separate studies provided more information on the biochemical process that causes erections, which helped scientists understand how sildenafil could enhance the effects of sexual stimulation and open up blood vessels in the penis. Sildenafil was then studied in men with erectile dysfunction, and in 1998 it was approved by the FDA specifically for treatment of ED. When Pfizer lost its UK patent for the drug in June 2013 it made way for generic manufacturers to produce sildenafil, or ‘generic Viagra’.

It costs a fraction of the price of Viagra, and has made the treatment more accessible to a wider range of patients.

You can now choose to buy Viagra, Pfizer’s branded drug, or sildenafil, the generic version.

Branded Viagra comes in small diamond-shaped blue pills – Pfizer has also patented this pill design and appearance.

Sildenafil is sold as white or blue tablets, with different characteristics depending on the brand. Some have chalky finishes while others are smooth, and some are scored for easy division, while others are not. Both Viagra and the different brands of sildenafil can be purchased in 25mg, 50mg, and 100mg preparations, and there is no significant difference between them in terms of active ingredients.

Sildenafil tablets can come in many shapes, colours, and sizes – see comparing brands of sildenafil. As a generic medicine, sildenafil is produced by a number of manufacturers, and competition among them helps to regulate its price and keep it affordable for consumers. Branded Viagra is only produced by best place to buy generic viagra Pfizer, whose name recognition and customer loyalty allow it to charge a higher price for its renowned ‘little blue pills’. It is a requirement for the generic version to contain the same levels of the active ingredient in the body as its branded alternative, which is known as bioequivalence.

Before generic drugs are licensed for sale the manufacturer must demonstrate bioequivalence to the licensing authorities (the European Medicines Agency). If you have a private prescription for Viagra, the branded drug must be dispensed; but you may ask for sildenafil at the time that the prescription is made. They are considered equally effective, however patients must follow proper protocol for optimum results. Also note that if the condition does not respond to the initial dose of Viagra or generic sildenafil, a higher dose may be required (after several unsuccessful attempts). Packaging differences: Viagra 100mg tablets and Mylan sildenafil 100mg tablets. Although Viagra is the most well-known medication for erectile dysfunction, a number of alternative treatments have become available in recent years. Though many people would like to know which treatment is better, there really is no straightforward answer to that question.

Both treatments can help men achieve satisfying erections and beat their erectile dysfunction, but both also have differing characteristics which will suit different men in different ways.

You should bear in mind that the effectiveness of the treatment varies from one man to another, depending on the cause of the erectile dysfunction, its severity and the amount of sexual stimulation the patient receives.

Therefore until you try for yourself, you cannot be sure of the exact results you will achieve.

They relax the smooth muscles in the blood vessels supplying the penis. This relaxation increases blood flow to aid an erection.

However Viagra and Cialis have different active ingredients.

In Viagra the PDE-5 inhibitor is sildenafil, while in Cialis it is tadalafil . Some men may react better to one active ingredient than the other.

However both sildenafil and tadalafil work via the same mechanism so you should never take the two drugs together. Nor should you take more than one Viagra or Cialis pill at any one time.

Both drugs require a sexual stimulus in order to take effect. Neither Viagra or Cialis will cause an erection on their viagra timing tablet price own.

Viagra was initially developed and tested in the UK to treat angina and was meant to relax the blood vessels that supply the heart. While the results for treating angina were disappointing, many participants reported developing erections after taking Viagra.

Further research showed that Viagra relaxed the blood vessels supplying the erectile tissues. The medication was launched in 1998 by Pfizer, and approved by the European Medicines Agency and US Food and Drug Administration, as the first oral drug to treat erectile dysfunction. Following the launch of Viagra, Eli Lilly joined forces with the ICOS Corporation to develop a newer version of this erectile dysfunction treatment.

This treatment, Taladalafil, was approved for sale in 2002 in Europe, then in the US the following year. You can take Cialis as little as 30 minutes before you plan to have sex; whereas Viagra must be taken at least one hour before sex.

If you have a large meal shortly before taking a pill, it will slow down the rate at which Viagra takes effect. In contrast, you can take Cialis before or after eating. With both treatments you should limit your alcohol intake to enjoy the greatest effects. It is not unusual for a man not to respond to erectile dysfunction treatment the first time he takes it. Indeed it is recommended you try taking the tablet on up to eight occasions.

Then if no results are forthcoming discuss with your doctor about switching to a different dose or form of treatment. The biggest difference between Viagra and Cialis is the amount of time their effects last.

Viagra remains effective for 4 to 6 hours, which offers ample opportunity to have sex online generic viagra on multiple occasions if you wish. However Cialis typically allows you to achieve erections for up to 36 hours after taking a tablet.

Although Cialis lasts for up to 36 hours, this does not mean you will have an erection throughout that time – it should only happen when you are sexually stimulated. Cialis has comfortably the longest effectiveness period of any erectile dysfunction drug on the market.

Side effects for either drug are rare but not unheard of.

As Cialis and Viagra are both PDE-5 inhibitors, they have similar side effects; although you may find that because Cialis is effective for longer, any side effects you experience may also last for longer. The most likely unwanted effects are light-headedness, headaches or flushing to the face. Nasal congestion, indigestion and visual changes are sometimes experienced as well. If you experience chest pain or a prolonged erection for more than four hours, you must seek urgent medical help.

Both Viagra and Cialis are prescription drugs so you must consult with a doctor before you can take them.

Cost is another notable distinction between Viagra and Cialis. The longer effectiveness of Cialis is reflected in its price. While Cialis is slightly more expensive than Viagra, many non prescription viagra online men will consider the vastly greater duration period of Cialis to represent good value for money.

Equally, plenty of men will prefer the cheaper price and renowned brand name

offered

But ultimately it depends entirely on the individual. Sildenafil and Tadalafil are the most well-known of all the ED medications.