Inada and Inagaki reported dose equivalence for drugs used to treat Parkinson's disease in Japan. The authors are from Seiwa Hospital and Aoyama Gakuin University in Japan.
Drug
Equivalent Dose
amantadine
100
benztropine
1
biperiden
2
diphenhydramine
30
hydroxyzine
65
mazaticol
8
metixene
10
piroheptine
4
profenamine
100
promethazine
50
trihexyphenidyl
4
where:
• Benztropine and Metixene are no longer available in Japan.
multiple of the equivalent dose =
= (actual dose) / (equivalent dose)
To convert to another drug in the table:
dose for new drug =
= (multiple of the equivalent dose for previous drug) * (equivalent dose for new drug)
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