Drug companies always have to go through a really long testing phase before they are approved to sell their drugs to patients. This process usually takes 10 to 20 years to complete, and drug companies spend significant time and money looking for people who qualify to enroll in a clinical trial. Most of these trials require the person to already have a certain disease or condition, but others are simply tests for vitamin supplements, and others are for common problems like colds, allergies, or the flu.
So, if you don't mind submitting yourself to needles, pills, and medical exams, you can go to http://clinicaltrials.gov/ct2/search/browse and look for an active clinical trial and enroll yourself in it as a human guinea pig. Pretty much all of these trials will pay you to be tested. go have a look. There may be something going on in your region, and you can pick up decent cash this way. The only risk is that these drugs have not been adequately tested yet, and they might come with ridiculous side effects. Thats why they are testing them.