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Acute Toxicity Study
What is an Acute Toxicity Study?
An acute toxicity study is a short-term toxicity test conducted to evaluate the adverse effects produced by a test substance following a single dose or multiple doses administered within 24 hours (or a single inhalation exposure).
Animals are observed for signs of toxicity and mortality for at least 14 days. The study is used to identify hazards, classify chemicals, and provide information for risk assessment.
Observation Period: Acute toxicity testing involves administering a test substance at defined dose levels to experimental animals and monitoring them for signs of toxicity over a specified observation period, typically ranging from 24 hours to 14 days.
OECD Test Guidelines
Seven internationally recognized OECD test guidelines govern acute toxicity studies across oral, inhalation, and dermal routes of administration.
Acute Oral Toxicity
Fixed Dose Procedure
Acute Oral Toxicity
Acute Toxic Class Method
Acute Oral Toxicity
Up-and-Down Procedure
Acute Inhalation Toxicity
Standard Protocol
Acute Inhalation Toxicity
Acute Toxic Class Method
Acute Inhalation Toxicity
Fixed Concentration Procedure
Acute Dermal Toxicity
Fixed Dose Procedure
Principle of the Study
Acute toxicity testing is based on administering a test substance as defined dose levels to experimental animals and monitoring them for a sign of toxicity over a specific observation period typically 14 days.
The severity, onset, duration of reversibility of toxic effects are recorded. Animals are observed for changes in behavior, physiological , functions and mortality. At the end of the study, gross pathological examinations are performed to identify any treatment-related abnormalities.
Objectives of Acute Toxicity
Each acute toxicity study is designed to achieve specific scientific and regulatory objectives.
- 1Determination of the toxic effects of a test substance following single exposure
- 2Identification of clinical signs associated with toxicity
- 3Determination of Mortality and morbidity rates
- 4Identification of target organs affected by the test substances
- 5Establishment of dose levels for subsequent subacute and chronic toxicity studies
- 6Estimation of lethal dose (LD50) or toxic dose range
- 7Assessment of potential hazards to humans and animals
Experimental Animals
Standardized rodent models are selected based on regulatory acceptability and biological relevance.
Environmental Conditions
Controlled housing conditions are maintained throughout the study to minimize variability and ensure animal welfare compliance.
Routes of Administration
The route of administration is selected based on the intended use of the test substance and the applicable OECD guideline.
Oral Route
Oral Gavage, Stomach tube, Intubation cannula
Dermal Route
Topical Application, Dermal Application
Inhalation Route
Inhalation Chamber, Head/nose-only exposure, Whole-body Exposure
Suitable Product Types
Acute toxicity studies are essential for determining the safety profile of a wide range of products before clinical use or regulatory approval.
Pharmaceutical Products
Chemical Products
Nutraceutical Products
Herbal Products
Medical Devices