Which drug has become a commonly misused muscle relaxant, especially when combined with opioids and benzodiazepines?

• A. Carisoprodol
• B. Baclofen
• C. Cyclobenzaprine
• D. Dantrolene

Answer: (A)

The key idea is recognizing which muscle relaxant has the highest potential for misuse, especially when paired with opioids and benzodiazepines. Carisoprodol stands out because it’s centrally acting and well-known for abuse potential. Its active metabolite, meprobamate, adds sedative and anxiolytic effects, which people may seek when using opioids or benzodiazepines. This combination markedly raises the risk of profound sedation, respiratory depression, overdose, and dependence.

Other muscle relaxants listed don’t have the same prominent pattern of misuse with this specific combination. Baclofen can be misused but is less commonly linked to widespread abuse in typical practice. Cyclobenzaprine is sedating and can be misused in some contexts, yet it’s not as strongly associated with combining risks as carisoprodol. Dantrolene acts on calcium release in muscle cells and is mainly used for malignant hyperthermia or certain spastic conditions, with far less abuse potential in daily clinical use.