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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.
 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
Given event type and trigger, please tell me the arguments of all the listed option. Output format is "name1: role1; name2: role2". 
Event type: potential therapeutic event 
  Option: Treatment.Freq, Subject.Population, Combination.Drug, Subject.Gender, Treatment.Duration, Subject, Effect, Treatment, Treatment.Disorder, Treatment.Time_elapsed, Subject.Disorder, Subject.Race, Treatment.Route, Treatment.Dosage, Subject.Age, Treatment.Drug 
Text: {0} 
Answer:
 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