A posologist is a person who specializes in the science of drugs and their effects on the human body. This profession requires a vast knowledge of pharmacology and the ability to analyze and interpret prescriptions. Some synonyms for a posologist include a pharmacist, druggist, chemist, apothecary, and pharmacist technician. A pharmacist is responsible for dispensing medications, advising patients on their usage and monitoring their health to ensure that they are taking the medications correctly. A druggist is another name for a pharmacist or a person who works with drugs. A chemist is a professional who specializes in the chemistry of substances, including drugs. An apothecary is an old term for a pharmacist who prepared and sold medicinal remedies. Lastly, a pharmacist technician is a person who assists pharmacists in dispensing medications.