Which statement correctly describes the overall interaction risk when combining muscle relaxants with other CNS depressants?

• A. Increases risk of adverse effects and overdose
• B. Reduces efficacy
• C. No interaction
• D. Increases weight

Answer: (A)

When muscle relaxants are used with other CNS depressants (like alcohol, benzodiazepines, or opioids), their effects on the central nervous system add up or amplify. This increases the risk of adverse effects such as excessive sedation, dizziness, impaired coordination, respiratory depression, and even overdose. That’s why the statement describing an increased overall interaction risk leading to more adverse effects and overdose is the best choice. The idea that there’s no interaction, that efficacy is reduced, or that weight increases do not fit, since these combinations are well known to heighten CNS depression rather than improve efficacy or cause weight gain.