results. Sometimes a drug that passes all of the earlier clinical trials is approved for the market, and later turns out to have unwanted long-term effects. But the important point is that there is a system, one with very well established protocols and regulations, so if a researcher or drug company messes up somewhere along the way, either intentionally or unintentionally, there is accountability. The same simply cannot be said of the illegal imports discussed above. Nor can it even be said about most of the legal but unregulated remedies and supplements and treatments on the market, many of which are ineffective at best, harmful at worst, and sometimes as pricey as some prescription drugs. sildenafil , viagra samples,purchase viagra online, cialis without prescription,cialis soft tabs,cialis cost