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polytherapy
polytherapy n.
Brit. 
/ˌpɒlɪˈθɛrəpi/
, /ˌpɒlɪˈθɛrəpi/U.S. /ˌpɑliˈθɛrəpi/
Medicine (the use of) a treatment which combines two or more medications or other therapies to treat a single condition./ˌpɑliˈθɛrəpi/ΚΠ
1930 Lancet 21 June 1330/2 Risks may be modified, if they cannot be removed by polytherapy.
2003 Seizure 25 384 Patients on polytherapy experienced significantly more side effects.
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