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Saturday, 13 August 2011

What is Viagra

About Viagra.

Viagra is a medicine used to treat erection difficulties, known as erectile dysfunction (ED). Since it first became available in 1998, Viagra has helped more than 35 million men around the world improve their sex lives.8 Amazingly, approximately 6 tablets are dispensed every second worldwide. No other oral therapy for ED has been studied as much or has the same amount of real-world experience as Viagra since its launch.8
Viagra comes in three tablet strengths, 25mg, 50mg, and 100mg. The most commonly used strength in New Zealand is the 100mg.9 Viagra can be used once a day.10


How does Viagra work?

Viagra is a medicine that treats the physical ED problem by increasing blood flow where you need it. With Viagra, you must be sexually excited to get an erection.10
Here’s what usually happens when a man is sexually aroused:
  • The arteries in the penis relax and widen (this allows more blood to flow into the penis).
  • The increased blood flow causes the penis to become hard and erect.
  • The veins that normally carry blood away from the penis get compressed (this restricts the blood flow out of the penis).
  • More blood begins flowing in and less flows out, making the penis larger; this causes an erection.
For men with erection problems the nerves or blood vessels that play a part in this process may not work properly – Viagra helps to re-establish this process of improved blood flow to the penis.
Most men on Viagra achieve Grade 4 erections (penis is completely hard and fully rigid) regardless of their erection grade prior to treatment.11 ♂
Another aspect of treatment with Viagra is the predictable and rapid response men get from the medication. Studies have shown that for some men it begins working as early as 14 minutes and for most men within 30 minutes. Viagra works for at least 4 hours so you can have sex within a natural time frame.10,12
From a 6 week randomised (n=307 men), double blind placebo controlled trail of flexible dose sildenafil with a six week open label extension. In the open label extension 61% of patients who switched from placebo to Viagra and 67% of patients who initially started on Viagra achieved a Grade 4 erection.11
†Improvements in self esteem, confidence and sexual relationship satisfaction compared to placebo. Viagra® is an unfunded medicine GP fees and a pharmacy charge will apply. Viagra (sildenafil 25, 50, 100mg tablets) is a prescription medicine for use by men in the treatment of erection problems resulting in a natural response to sexual stimulation. Consult your GP to see if Viagra is right for you.
Do not use Viagra if you: are being treated for angina (chest pain) or other heart conditions with medicines called nitrates; are using amyl nitrite; have heart or blood vessel problems that make sexual intercourse inadvisable; have suffered a heart attack or stroke in the last 6 months; have severe liver problems; have unusually high or low blood pressure that is not effectively treated; have loss of vision in one or both eyes from an eye disease called non-arteritic anterior ischaemic optic neuropathy (NAION); have an eye disease called retinitis pigmentosa; have an allergy to Viagra or similar medications.
Side effects include headache, dizziness, flushing, indigestion, temporary changes in vision, stuffy nose, diarrhoea, urinary tract infection or rash. If any of the following happen, tell your GP immediately or go to Accident and Emergency at your nearest hospital: signs of allergy such as shortness of breath, wheezing or difficulty breathing; swelling of the face, lips, tongue or other part; chest pain; sudden decrease or loss of hearing; seizures, fits or convulsions; a persistent and painful erection; loss of eye sight in one or more eyes.
Use strictly as directed. If symptoms continue or you have side effects see your GP. Further information on Viagra is available from www.medsafe.govt.nz or from Pfizer New Zealand Ltd, PO Box 3998, Auckland. Freephone 0800 736 363 or www.pfizer.co.nz. ®Viagra is a registered trademark of Pfizer Inc. Date of preparation: 10/07/2008.
References. 1. Goldstein I et al. N Engl J Med 1998; 338: 1397-1404. 2. Mulhall J et al. J Sex Med 2007; 4:448-464. 3. Althof et al. J Gen Intern Med 2006; 21: 1069-1074. 4. Padma Nathan et al. Int J Impotence Res 2006 18, 423431. 5. Dean et al. European Urology Supplements 5 (2006) 761-766. 6. Dean et al. European Urology Supplements 5 (2006) 773 – 778. 7. Montorsi. J Sex Med 2005; 2: 658-667. 8.Pfizer data on file. 9. IMS Data 2009. 10. Viagra Datasheet. 11. Kadioglu A et al. J Sex Med 2008; 5: 726-734 12. Eardley I et al. Br J Clin Pharmacol 2002; 53: 61S-65S. 13. McCullough AR. et al. Urology 2002; 60(Suppl 2B): 28-38. R&A070507B DA985AC TAPS NA3473

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