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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