| M - Musculo-Skeletal System |  |   |  
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| M03 - Muscle Relaxants |  This group comprises peripherally, centrally and directly acting muscle relaxants. See also G04BD - Drugs for urinary frequency and incontinence. 
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| M03A - Muscle Relaxants, Peripherally Acting Agents |  This group comprises peripherally acting muscle relaxants such as curare alkaloids and suxamethonium. The drugs in this group are mainly used together with anesthetics. 
  |  As for other drugs used in general anesthesia (see N01A), no DDDs have been established in this group because the doses used vary substantially. 
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| M03AX - Other Muscle Relaxants, Peripherally Acting Agents |  Botulinum toxin used e.g. for treatment of blepharospasm, hemifacial spasm and migraine is classified in this group. 
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| M03AX01 - Botulinum Toxin |  
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