Y55 Agents primarily acting on smooth and skeletal muscles and the respiratory system ( Search )
- Y550 Oxytocic drugs ( Search )
- Y551 Skeletal muscle relaxants [neuromuscular blocking agents] ( Search )
- Y552 Other and unspecified agents primarily acting on muscles ( Search )
- Y553 Antitussives ( Search )
- Y554 Expectorants ( Search )
- Y555 Anti-common-cold drugs ( Search )
- Y556 "Antiasthmatics, not elsewhere classified" ( Search )
- Y557 Other and unspecified agents primarily acting on the respiratory system ( Search )
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