There are two answers: the original meaning was any substance used medicinally (and in earlier history any substance used in dyeing, chemistry or the arts).
The modern term has become much more closely related to narcotics and other illegal chemicals used to alter perception or state of mind - but strictly speaking "drug" also refers to everyday painkillers, cough medicines and so on.
Dose titration is the medical term meaning process for finding the proper dosage of a drug.
antihemorrhagic
Contraindication is the usual term for that.
alcoholism
antibiotic
Adverse Effects
Adverse Drug Reactionside effect
The medical term for a drug that acts on the mind is "psychoactive drug". These drugs can affect mood, cognition, behavior, and perception by acting on the central nervous system.
Bioavailability
The medical term for a drug that reduces bleeding is "hemostatic agent." These drugs work by promoting blood clotting and stopping the flow of blood.
Spun is the past and past participle of "spin".
The medical term for the study of adverse reactions or drug interactions is pharmacovigilance. It involves monitoring the safety of medications and assessing their risks and benefits in real-world settings.