Buy Viagra Online

Pfizer is the only manufacturer in the U.S.A. allowed to produce and distribute Viagra, any generic version of Viagra infringes their patent. Viagra (Sildenafil Citrate), is a medication often prescribed for the treatment of erectile dysfunction. This is a condition where a man is unable to develop an erection or is unable to keep an erection during sex. A few other conditions can warrant the use of Viagra; it may be prescribed for the treatment of pulmonary arterial hypertension. Viagra and all vasodilators may cause severe side effects in patients with cardiovascular diseases and should be taken under strict doctor supervision. Before ordering Viagra you should have an extensive medical exam and approval from your cardiologist.

Five things you must know before you buy Viagra® online

Viagra is a prescription medicine used to treat erectile dysfunction. This medicine can help many men when it is used as prescribed by their doctors. However, Viagra is not for everyone. Only your doctor can decide if it is right for you.
 
If you take medicine that contains nitrates – either regularly or as needed – you should never take Viagra. If you take Viagra with any nitrate medicine or recreational drug containing nitrates, your blood pressure could suddenly drop to an unsafe level. You could get dizzy, faint, or even have a heart attack or stroke.
 
If you take alpha-blockers or hypertensive medications, you must first talk to your doctor. Physicians should advise patients of the potential for Viagra to augment the blood pressure lowering effect of alpha-blockers and anti-hypertensive medications. Concomitant administration of Viagra and an alpha-blocker may lead to symptomatic hypotension in some patients.
 
If you have any of the following underlying conditions, you must first talk to your doctor. There are no controlled clinical data on the safety or efficacy of Viagra in the following groups; if prescribed, this should be done with caution.
• have ever had any heart problems (e.g., angina, chest pain, heart failure, irregular heartbeats, heart attack, or narrowing of the aortic valve)
• have ever had a stroke
• have low or high blood pressure
• have ever had severe vision loss
• have a rare inherited eye disease called retinitis pigmentosa
• have bleeding disorders or active peptic ulceration
 
Taking Viagra can cause priapism, and painful erections greater than 4 hours in duration. In the event of an erection that persists longer than 4 hours, immediate medical assistance should be sought. If priapism is not treated immediately, penile tissue damage and permanent loss of potency may result.
 
Viagra has side effects such as headache, flushing of the face, and upset stomach. Less common side effects that may occur are temporary changes in color vision (such as trouble telling the difference between blue and green objects or having a blue color tinge to them), eyes being more sensitive to light, or blurred vision.

Viagra Online Pharmacy

Viagra appeared as a result of scientific research by Pfizer, aimed at establishing the effect of sildenafil citrate on the heart muscle. Sildenafil citrate had little effect on blood circulation in the heart muscle but caused sufficient blood circulation in the genitals. To confirm these properties, extensive clinical trials have been conducted since 1993, showing that the drug is very effective and safe in the fight against erectile dysfunction. Eventually, the US Department of Drug Enforcement approved the use of the drug. Viagra has been on the market since 1996.

The effectiveness of Viagra has been tested on more than 3 men of all ages with erection problems up to 20,000 years old, caused by mental or physical factors or a combination of mental and physical factors. According to the results of these studies, the effectiveness of Viagra in restoring a healthy erection and improving successful sexual relationships in many patients has been proven. This applies to most diabetics, and spinal cord injury patients, and has been shown to be effective in patients taking multiple drugs at the same time. The exclusive patent for Viagra expired at the end of June 26th. After the patent expired, Pfizer decided to create its own generic Sildenafil Pfizer in several European countries.

Mechanism action of Viagra

Sildenafil citrate is a specific inhibitor of cyclic GMP-like phosphodiesterase type 5 (PDE5) in smooth muscle. Sildenafil causes the accumulation of GMF in muscle cells, which leads to the relaxation of the muscles of the penis. In patients with erectile dysfunction, Viagra enhances the action of nitric oxide (NO). When sexual stimulation causes local release of NO, inhibition of PDE5 by sildenafil citrate leads to an increase in HMF levels and increased blood flow in the cavernous bodies of the penis.

However, studies at the University of South Wales have shown that the active ingredient sildenafil, which is found in drugs that help men restore erections, can contribute to unusual visual reactions and negative effects. long-term vision.

According to scientists, sildenafil may contribute to the formation of a barrier to the functioning of an enzyme important for the transmission of light signals to the brain from the retina. For example, clinical trials of Viagra have shown that excessive use can contribute to the development of temporary visual impairment, even in healthy people. Among the side effects of Viagra abuse may be excessive sensitivity of the eyes to bright light, blurred vision and discoloration.

In a recent study published in the Journal of Neuro-Ophthalmology, Dr. Pomeranz reported several new cases of NAION (non-arterial ischemic optic neuropathy). The FDA has confirmed the CBS News report on the connection between Viagra and NAION in about 50 cases. There is information among American health organizations that the most common methods used to improve erections, including Viagra, can sometimes cause blindness, and vision problems such as nearsightedness or farsightedness.

Cialis has a different composition, but acts in the same way as Viagra – it causes a strong and persistent erection. You can get acquainted with the differences between Cialis and Viagra. Buy Cialis or Viagra without a prescription – choice and reviews in an online pharmacy. Comparison of the price of Cialis and Viagra in a pharmacy.

Viagra – Side Effects

This drug causes non-arterial ischemic optic neuropathy. The number of cases caused by the use of this drug is about nineteen percent.

It turned out that the number of diseases associated with optic neuropathy was eighteen times higher in people who took Viagra. A detailed study of diseases clearly shows that the occurrence of blindness is inextricably linked with the use of this and similar drugs. In some cases, the men’s vision was completely restored. However, the authorities authorizing the use of this drug believe that its effect on the development of blindness has not been proven, and from the point of view of biochemistry, this is unlikely.

Representatives of the pharmaceutical company Pfizer, which produces the famous blue pill, refute the arguments of scientists and continue to insist on the safety of the miracle pill. According to them, over the years of marketing the drug, the company’s specialists have not observed cases of decreased vision in patients. This means that the risk of visual impairment, if any, is extremely low.

In the elderly, vision is sharply reduced, which leads to blindness and problems with blood vessels.