Compare and contrast the developings that led to one merchandise do drugs launched in the mid-20th century and one launched in the past 25 years. Over a long period of beat, the cost and the magazine taken for drug ontogeny has soared. The two examples that have been selected to place and contrast are penicillin and sildenafil; where both have been arrived serendipitously. Penicillin breakthrough changed the course of medicine as the active ingredient that was defend turned out to be an infection-fighting agent of enormous potency. The festering of penicillin has served as the general model for most drug evolution and find during this specific time period. Research that resulted in sildenafil was originally conducted in order to find a third compound with anti-hypertensive properties and over time a turning headspring had occurred, perhaps not the final one, where a completely reinvigorated indication has been developed. In the early 20th century, a epidem ic of diseases arose as a result of bacterial infections which killed many individuals delinquent to the lack of available antibiotics. It was this series of incurable diseases that spurred research into drugs that could engage across conditions caused by bacterial infection. In 1928, a Scotch life scientist named Alexander Fleming made a serendipitous discovery of the antibiotic penicillin.

On observation of the Staphylococci culture plates left-hand(a) for several(prenominal) weeks, he noticed contamination by fungi (Brown, 2005). fatten out the fungi hurls were zones of inhibition, suggestive of  an agent or sub stance containing anti-bacterial properties ! existence produced it. During further analysis, he realised that only the Penicillium lick produces this substance. The substance was then consequently named Penicillin and became available on the grocery store in 1942 (Brown, 2005).  [pic] Figure 1. Chemical structure of Penicillin (Fukami, T et al., 2006). Penicillin is a class of drug called beta-lactam antibiotics (Joint Formulary Committee, 2012). A...If you want to get a full essay, order it on our website:
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