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[Muscle irritation study on T-1982]
Abstract:
The local irritation effect of T-1982 after the intramuscular injection into the musculus vastus lateralis was examined in rabbits. T-1982 was dissolved by the way of clinical use and was injected singly into the musculus vastus lateralis. Then the degree of muscular injury at the time of 2 days and 7 days after the injection was judged from muscle weight ratio, gross local observation and histological observation. The degree of muscular injury caused by T-1982 was compared with that of saline, 0.75% acetic acid and 6% acetic acid. On the degree of muscular injury of T-1982 was almost equal to that of 0.75% acetic acid, but milder than 6% acetic acid. From these, it was concluded that the local irritation effect of T-1982 was grade 3.
Insights
The intramuscular injection of T-1982 in rabbits showed a local irritation effect comparable to 0.75% acetic acid. This study determined T-1982
Area of Science:
- Pharmacology
- Toxicology
- Preclinical Research
Background:
- Intramuscular injections can cause local tissue reactions.
- Evaluating the local irritation potential of new drug formulations is crucial for safety.
Purpose of the Study:
- To assess the local irritation effect of T-1982 following intramuscular injection in rabbits.
- To compare the irritation potential of T-1982 with saline and acetic acid solutions.
Main Methods:
- T-1982 was administered via single intramuscular injection into the musculus vastus lateralis of rabbits.
- Muscle injury was evaluated at 2 and 7 days post-injection using muscle weight ratio, gross observation, and histological analysis.
- Comparisons were made against saline, 0.75% acetic acid, and 6% acetic acid controls.
Main Results:
- T-1982 demonstrated a local irritation effect.
- The muscular injury caused by T-1982 was found to be similar to that of 0.75% acetic acid.
- T-1982 induced milder irritation compared to 6% acetic acid.
Conclusions:
- The local irritation effect of T-1982 was classified as grade 3.
- T-1982 exhibits a moderate local irritation profile upon intramuscular administration.