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Generic viagra sold in stores to prevent pregnancy is less effective than previously thought. New figures reveal there may be a 'cloak of invisibility' around the medication, which is known to cause side-effects such as headache, nausea, and dizziness, when taken for longer than three months. The study, published in Clinical Pharmacology & Therapeutics, found women taking long-term non-hormonal methods with a combination of birth control pills and other hormones had a 52 per cent chance of becoming pregnant within six months, compared to only 31 per cent for women with standard non-hormonal birth control methods. The study, from a team University of Where to get viagra ireland Cambridge and Queen Mary, University of London, also found long-term non-hormonal contraception did not appear to reduce the chance of pregnancy by more than 10 per cent – which is the level usually recommended for women trying to have a baby. But, according to authors of the study, even more effective non-hormonal methods had a 'sub-optimal' effect when compared to standard hormonal contraception. However, this is the first time scientists have had figures to show women who take hormonal birth control pills do not have a better chance of conceiving than those taking less effective non-hormonal methods, Dr Gail Parry and colleagues from the University of Cambridge said. They say the findings suggest that long-term progestin-only contraceptive use may be more effective at preventing pregnancy than commonly-prescribed hormonal methods such as patches and pills. However, because non-hormonal methods do not carry a 'nausea' or 'dizziness' side-effect as are seen with female hormonal contraceptives, doctors might encourage women taking hormones to consider switching non-hormonal methods in the first trimester of pregnancy. However, as more information becomes available about the impact of non-hormonal methods and contraceptive choices in general, it is likely that prescribing these as a single option in primary care, or at least as part of a package options, will be more common. Women taking long-term non-hormonal methods with a combination of birth control pills and other hormones had a 52 per cent chance of becoming pregnant during the first six months, but were 51 per cent likely to become pregnant in the online pharmacy uk generic second six months compared to 31 per cent of women taking standard non-hormonal contraception. The researchers wrote: 'Although most previous studies showed that hormonal contraception is associated with shorter pregnancy than unmedicated methods, our results indicate more substantial differences Generic online pharmacy uk between progestin-only and nonprogestin-only methods. 'Furthermore, the efficacy of progestin-only contraceptive use has been generally underestimated as compared with long-acting methods, only one study reporting an efficacy of 82 per cent and one study reporting 100 per cent efficacy.' According to the study, researchers analysed birth rates in 15 countries including the UK and US, from 1986 to 2006. They compared methods used to prevent pregnancy, including the use of oral contraceptiv