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After the dose of methylprednisolone was reduced from 40 mg to 20 mg i.v. q6h and shifted to other anti-asthma treatment by procaterol metered dose inhaler via spacer, the psychotic reaction disappeared a few hours later.
 ( potential therapeutic event: disappeared ,  After the dose of methylprednisolone was reduced from 40 mg to 20 mg i.v. q6h and shifted to other anti-asthma treatment by procaterol metered dose inhaler via spacer: Treatment, a few hours later: Treatment, psychotic reaction: Treatment.Disorder, a few hours: Treatment.Time_elapsed, methylprednisolone: Treatment.Drug, reduced from 40 mg to 20 mg i.v. q6h: Treatment.Dosage, spacer: Treatment.Route) 
Locate the role in the text that participated in the event based on the event type and return it in the event list. 
 Option: Event type: adverse event,potential therapeutic event, Arguments type: Treatment.Disorder,Treatment.Time_elapsed,Treatment.Dosage,Subject.Race,Treatment.Drug,Treatment.Route,Subject.Disorder,Treatment.Freq,Treatment,Effect,Subject.Population,Treatment.Duration,Combination.Drug,Subject,Subject.Age,Subject.Gender. 
Text: {0} 
Answer:
 ( potential therapeutic event: disappeared ,  After the dose of methylprednisolone was reduced from 40 mg to 20 mg i.v. q6h and shifted to other anti-asthma treatment by procaterol metered dose inhaler via spacer: Treatment, a few hours later: Treatment, psychotic reaction: Treatment.Disorder, a few hours: Treatment.Time_elapsed, methylprednisolone: Treatment.Drug, reduced from 40 mg to 20 mg i.v. q6h: Treatment.Dosage, spacer: Treatment.Route) 