A subchronic toxicity study typically lasts about how long?

A subchronic toxicity study typically lasts about how long?

• A. 1 month
• B. 3 months
• C. 6 months
• D. 1 year

Answer: (B)

In toxicity testing, subchronic studies are designed to reveal effects from repeated exposure over a moderate period, long enough for cumulative or progressive toxic effects to appear but short enough to be practical for screening before long-term studies. The standard duration is about 90 days, roughly three months, which allows observation of potential organ-specific toxicity and any reversibility after exposure ends. A one-month timeframe is generally considered subacute and may miss effects that only show up with longer exposure, while six months to a year are used for chronic toxicity assessments to study longer-term or lifetime risk. Therefore, the typical subchronic study lasts about three months.

In toxicity testing, subchronic studies are designed to reveal effects from repeated exposure over a moderate period, long enough for cumulative or progressive toxic effects to appear but short enough to be practical for screening before long-term studies. The standard duration is about 90 days, roughly three months, which allows observation of potential organ-specific toxicity and any reversibility after exposure ends. A one-month timeframe is generally considered subacute and may miss effects that only show up with longer exposure, while six months to a year are used for chronic toxicity assessments to study longer-term or lifetime risk. Therefore, the typical subchronic study lasts about three months.