Medicine today is evidence-based already. So anybody couldn’t just say this and that is a good or better medicine from another not unless a proven and well-tested study has been presented.
That is why there is such thing as clinical trials being done today. Clinical trials are procedures wherein a specific medical study of certain medicines or any medical-related studies are being tested in a number of human subjects. This is done to simply evaluate the efficacy of the research matter.
Other data aimed to obtain during the said clinical trials include possible good side effects of the certain medicine, adverse drug reactions, and reactions to different drug interactions.
But of course, a company or anybody couldn’t just easily perform clinical trials or testing since beforehand, a more critical procedure has been done already which usually took a year or more. And this clinical trial, after a successful clinical trial registration, this would also took usually at a minimum of six (6) months to years.
Although proving a certain medicine to be safe and effective by doing a clinical trial method would take some time, it is after all something worth all the time and finances spent because every health practitioner do not have other goals in their medical practice but to help provide a better life to every patient.