<prompt> Methylphenidate is used for:Attention deficit disorderAlzheimers diseaseSeizure disorderObsessive compulsive disorder  <response>: Ans. a Attention deficit disorderRef.:KDT 6th ed. 470 Methylphenidate is the preferred drug for the treatment of attention deficit hyperkinetic disorder ADHD. Other drugs used for this indication are amphetamines, atomoxetine and pemoline. Pemoline has been withdrawn due to life threatening hepatotoxicity. Abuse of drugs like amphetamine, phencyclidine, methylphenidate, flumazenil etc. causes seizure and is NOT used for seizure disorder. DOC for alzheimers disorder- Rivastigmine Donepezil DOC for OCD: Fluoxetine 