Glossary
Plain explanations for medical terms used on this site.
- Agonist
A molecule that activates a receptor, producing a biological response.
- Akathisia
A feeling of inner restlessness with a need to move (a type of movement side effect).
- ANC(Absolute Neutrophil Count)
A blood test measuring infection‑fighting white blood cells.
- Antagonist
A molecule that blocks a receptor and prevents activation by other substances.
- BMI(Body Mass Index)
A number that uses height and weight to estimate body fat.
- Boxed warning
The FDA’s strongest safety warning found at the top of a drug’s label.
Also called: black box warning
- CYP(Cytochrome P450)
A family of liver enzymes that process many medicines (for example, CYP3A4, CYP2D6).
Also called: CYP enzymes
- DDI(Drug–drug interaction)
When one medicine changes how another medicine works or is processed.
Also called: drug interaction
- DOI(Digital Object Identifier)
A permanent identifier for a digital article (e.g., 10.xxxx).
- ECG(Electrocardiogram)
A test that records the heart’s electrical activity.
Also called: EKG
- EPS(Extrapyramidal symptoms)
Movement side effects like stiffness, tremor, or restlessness (akathisia).
Also called: movement side effects
- FGA(First‑generation antipsychotic)
Also called typical antipsychotics; older agents such as haloperidol and fluphenazine.
Also called: typical antipsychotic, first generation antipsychotic
- Half‑life
How long it takes for half of a medicine to leave the body.
Also called: t1/2
- Hepatic impairment
Reduced liver function; doses may need to be adjusted.
Also called: liver impairment
- HLA‑B*1502
A genetic marker; if present in some people of Asian ancestry, certain medicines can raise risk of severe rash.
Also called: HLA-B1502, HLA-B*1502
- In vitro
Studies done outside a living organism (e.g., test tube or cell culture).
- In vivo
Studies done in a living organism (e.g., in people or animals).
- Indications
The conditions a medicine is approved to treat.
Also called: uses
- LAI(Long‑acting injectable)
A shot given every few weeks/months that slowly releases medicine.
Also called: depot, injectable
- Meta‑analysis
A study that combines results from many studies to get a clearer answer.
Also called: systematic review with meta‑analysis
- Metabolism
How the body breaks down a medicine (often by liver enzymes).
- Metabolite
A substance formed when a medicine is broken down. Some metabolites are active (contribute to effects), others are inactive.
- MOA(Mechanism of Action)
How a medicine works in the body.
Also called: mechanism
- Monitoring
Tests or check‑ins to help use a medicine safely (for example, labs).
Also called: follow‑up
- Negative symptoms
Symptoms like reduced motivation, blunted affect, and social withdrawal.
- Open access
A research paper that is free for anyone to read online without a paywall.
Also called: OA
- Oral overlap
Taking pills for a short time after starting an injection so medicine is covered while the shot starts working.
Also called: overlap
- P‑glycoprotein(P‑gp)
A transport protein that pumps many drugs out of cells; can affect how medicines are absorbed and eliminated.
Also called: P-gp, P glycoprotein
- PDSS(Post‑Injection Delirium/Sedation Syndrome)
A rare reaction after some injections (like olanzapine LAI) that needs monitoring after the shot.
- PMCID(PubMed Central Identifier)
An ID for free, full‑text articles in PubMed Central.
- PMID(PubMed Identifier)
A unique number used to find a study in PubMed.
- Positive symptoms
Symptoms like hallucinations, delusions, and disorganized thinking often seen in schizophrenia.
- Prolactin
A hormone; some medicines can raise it and cause symptoms like breast changes.
- QRS
A part of the ECG tracing representing ventricular depolarization; excessive widening may signal conduction issues.
- QTc
A heart rhythm measure on an ECG. Some medicines can prolong the QT interval.
Also called: QT interval
- RCT(Randomized Controlled Trial)
A study where people are randomly assigned to treatments to compare results.
- REMS(Risk Evaluation and Mitigation Strategy)
An FDA safety program for certain medicines.
- Renal impairment
Reduced kidney function; doses may need to be adjusted.
Also called: kidney impairment
- Serum level
How much medicine is in the blood.
Also called: blood level
- SGA(Second‑generation antipsychotic)
Also called atypical antipsychotics; generally lower EPS risk than FGAs and include agents like aripiprazole, quetiapine, risperidone, and olanzapine.
Also called: atypical antipsychotic, second generation antipsychotic
- SMI(Serious Mental Illness)
Conditions like schizophrenia, bipolar disorder, or schizoaffective disorder that substantially interfere with functioning and are the focus of this resource.
Also called: serious mental illness
- Steady state
The point at which a drug’s intake and elimination balance so blood levels stay consistent between doses.
Also called: steady‑state
- Tardive dyskinesia
Involuntary movements (like face/tongue) that can appear after long‑term use of some medicines.
Also called: TD
- TDM(Therapeutic Drug Monitoring)
Checking medicine levels in blood to guide safe and effective dosing.
Also called: therapeutic drug monitoring
- Therapeutic range
The blood level range where a medicine is most likely to work without undue side effects.
Also called: therapeutic drug level
- Trough
A blood level taken right before the next dose (lowest point).
Also called: pre‑dose level