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Maximum-Tolerated Dose
Safety & Toxicology

Maximum Tolerable Dose Study Services

The identification of the Maximum-Tolerable Dose (MTD) is one of the first steps when taking a drug candidate from in vitro to in vivo phase of drug discovery. The MTD is used to define the upper limit of dosing for efficacy testing, ensuring that drug exposure is high enough to evaluate activity but not so high that results are confounded by systemic toxicity.

The frequency and the route of administration play a role in the MTD as well as the mouse strain and the gender.

Maximum tolerable dose studies can be performed in naive or tumor-bearing mice, since tumor exposure can have an impact on how a mouse tolerates a drug.

FAQs:

How does Reaction Biology conduct maximum tolerable dose studies?

Reaction Biology offers end-to-end study support, including study design consultation, controlled compound administration, and stepwise dose escalation with appropriate group sizes. Our studies include comprehensive monitoring of clinical signs, body weight, and survival, with veterinary staff assessing animal welfare daily. We also provide detailed reporting of observed toxicities, dose-limiting effects, and recommended maximum tolerated dose, which can then be used to guide subsequent efficacy or IND-enabling toxicology studies.

How do MTD studies differ from LD50 studies?

MTD studies aim to identify the highest dose of a compound that does not cause unacceptable side effects, focusing on sub-lethal toxicity. In contrast, LD50 studies determine the dose that causes death in 50% of the test population. MTD studies are more relevant for establishing safe dosing in clinical settings.

What types of compounds can be assessed in maximum tolerable dose studies?

MTD studies can be conducted on a wide range of compounds, including small molecules, biologics, and novel therapeutic agents. These studies are essential for assessing the safety profile of various drug candidates before progressing to clinical trials.

What information is included in the final MTD study report?

An MTD study report typically includes detailed descriptions of study design, dosing regimens, clinical observations, body weight data, clinical pathology results, histopathological findings, and a determination of the maximum tolerated dose. This comprehensive data supports decision-making in subsequent stages of drug development.