Drug bank is an amazing database of pharmaceutical substances and everything about them. You can find almost every information about a drug that you wish to see from pharmacodynamics, mechanisms of action to pharmacoeconomics, and so on.
You can search by drug categories and filter your results by group (experimental, approved, withdrawn, illicit, investigational…)
They’ve also intended a separate section for COVID19, where you can find different reliable sources for information about the disease and listed experimental unapproved treatments, clinical trials summaries by drugs, external clinical trials, etc.
I use this database very often for my physiology and pharmacology class and I think it’s one of the best databases for not only medical students but also for medical workers, researchers, and students of other sciences such and pharmacy, chemistry, etc. It’s very easy to use and very nicely organized so you can find the information you’re searching for in no time.