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.
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 bdose–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.
To evaluate the toxic effects of repeated exposure to a test substance.
To identify target organs affected by the compound.
To establish the dose response relationship.
To determine the No Observed Adverse Effect Level (NOAEL).
To 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.
Wistar Rat (Rat Model)
Sprague Dawley Rat (Rat Model)
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
Suitable Product Types
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