(You were probably downvoted because supposing that a specific drug could have been a cause of damage, when potential causes of damage abound, may not sound sensible.)

I think you now understood that with «Pharmacology is the discipline that deals with drugs» what was meant is "If we interpret your questions as "could they have administered anything toxic", the answer would be "what they do is administering substances relevant to toxicity"".

I would approach the situation (just "my two cents") by trying to redirect towards health by maximizing healthy conditions. They do not sell "health pills" - but when one has had to take them, try to counterbalance that "compromise" with healthier lifestyle.