A Pharmacist Being a pharmacist is much harder than what you probably thought it was. Pharmacists in a hospital have many, many responsibilities. They must be very careful that they have measured the medication correctly, because one little mistake can be potentially fatal. Pharmacists must know what many of the medications do, and if there are any side effects and incompatibilities with other medications the patient might be on. For example, a person might be taking a medication for another problem, and if the physician and pharmacist don't notice that condition, the prescribed medication might cause a deadly interaction. This does not hap