A substance administered for the diagnosis, cure, treatment, or relief of a symptom or for prevention of disease
Drug
In the health care context, the words medication and drug are generally used interchangeably
Terms
Prescription
Generic name
Trade name (brand name)
Official name
Chemical name
Pharmacology
The study of the effect of drugs on living organisms
Pharmacy
The art of preparing, compounding, and dispensing drugs. The place where drugs are prepared and dispensed
Pharmacist
The licensed professional who prepares, makes, and dispenses drugs as ordered by a physician, dentist, nurse practitioner, or physician assistant
Pharmacopoeia
A book containing a list of products used in medicine, with descriptions of the product, chemical tests for determining identity and purity, and formulas and prescriptions
Therapeutic effect
The primary effect intended, that is, the reason the drug is prescribed
Side effect
An unintended effect of a drug, which may be either harmless or potentially harmful
Adverse effect
A severe side effect that may justify the discontinuation of a drug
Drug toxicity
Harmful effects of a drug on an organism or tissue, resulting from overdosage, ingestion of a drug intended for external use, or buildup of the drug in the blood because of impaired metabolism or excretion
Drug allergy
An immunologic reaction to a drug
Anaphylactic reaction
A severe allergic reaction usually occurring immediately after the administration of the drug
Drug tolerance
An unusually low physiological response to a drug, requiring increases in the dosage to maintain a given therapeutic effect
Cumulative effect
The increasing response to repeated doses of a drug that occurs when the rate of administration exceeds the rate of metabolism or excretion
Idiosyncratic effect
An unexpected effect that may be individual to a client, including under response and overresponse to a drug
Drug interaction
When the administration of one drug before, at the same time as, or after another drug alters the effect of one or both drugs
Synergistic effect
When two different drugs increase the action of one or another drug
Iatrogenic disease
Disease caused unintentionally by medical therapy
Drug abuse
The inappropriate intake of a substance, either continually or periodically
Drug dependence
A person's reliance on or need to take a drug or substance, which can be physiological or psychological
Key terms related to drug actions
Onset of action
Peak plasma level
Drug half-life (elimination half-life)
Plateau
Factors affecting medication action
Developmental factors
Gender
Cultural, ethnic, and genetic factors
Diet
Environment
Psychological factors
Illness and disease
Time of administration
Parenteral routes of administration
Subcutaneous (hypodermic)
Intramuscular (IM)
Intradermal (ID)
Intravenous (IV)
Types of medication orders
Stat order
Single order or one-time order
Standing order
PRN (as-needed) order
Essential parts of a medication order
Client's full name
Date and time
Drug name
Dosage
Route of administration
Ordering provider's signature
Developmental considerations for infants and children
Oral medications are usually prepared in sweetened liquid form to make them more palatable
Developmental considerations for older adults
Many changes enhance the possibility of cumulative effects and toxicity, such as impaired circulation delaying the action of medications given intramuscularly or subcutaneously