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Sub Acute Toxicity Study
What is Sub Acute Toxicity?
Subacute toxicity studies constitute an essential of pre-clinical safety assessment. These studies evaluate the potential toxic effects of a test substance following repeated administration over a short period, typically 28 consecutive days. They help identify target organ toxicity, determine safe dose levels, and assess the overall safety of a compound before further preclinical or clinical development.
Subacute toxicity studies provide critical data on the effects of repeated exposure to a test substance, support dose selection for subsequent studies, and contribute to regulatory safety evaluations and submissions.
Observation period and assessment: Minimum 14- 28 days to evaluate systemic toxicity, identify target organs, and determine the No Observed Adverse Effect Level (NOAEL).
OECD Test Guidelines
OECD test guidelines governing subacute toxicity studies across oral, dermal, and inhalation routes of administration.
Repeated Dose Oral Toxicity
28-Day Oral Study in Rodents
Repeated Dermal Toxicity
21/28-day Dermal Study
Repeated Inhalation Toxicity
28-Day Inhalation Study
Principles of Sub acute toxicity study
Subacute toxicity studies evaluate the toxic effects of repeated exposure to a test substance over a period of 28 days. Throughout the study, animals are monitored regularly for clinical signs of toxicity, changes in behavior, body weight, and general health status.
Animals that die or are humanely euthanized during the study undergo necropsy, while surviving animals are subjected to gross pathological examination at the end of the study period.
The study provides information on the potential toxic effects of the test substance, identifies target organs, establishes dose–response relationships, and supports the determination of the No-Observed Adverse Effect Level (NOAEL).
Objectives of sub-acute toxicity study
Each subacute toxicity study is designed to achieve specific scientific and regulatory objectives.
- 1To evaluate the toxic effects of repeated exposure to a test substance.
- 2To identify target organs affected by the compound.
- 3To establish the dose response relationship.
- 4To determine the No Observed Adverse Effect Level (NOAEL).
- 5To provide safety data for future long-term toxicity and clinical studies.
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, Dietary Administration, Drinking Water Administration
Dermal Route
Topical Application, Dermal Application
Inhalation Route
Head/nose-only exposure technique, Whole-body Exposure technique
Applications
Sub-Acute toxicity studies are essential for determining the safety profile of a wide range of products before clinical use or regulatory approval.
Pharmaceutical Products
Chemicals Products
Nutraceutical Products
Herbal Products
Medical Devices