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Appropriate dosage of fluphenazine decanoate injection should be individualized for each patient and responses carefully monitored. No precise formula can be given to convert to use of fluphenazine decanoate injection; however, a controlled multicentered study 1 , in patients receiving oral doses from 5 to 60 mg fluphenazine hydrochloride daily, showed that 20 mg fluphenazine hydrochloride daily was equivalent to 25 mg (1 mL) of fluphenazine decanoate injection every three weeks. This represents an approximate conversion ratio of mg ( mL) of decanoate every three weeks for every 10 mg of fluphenazine hydrochloride daily.