3 _____________________________________________________________________________________________________ ABSTRACT Pharmacotherapy is frequently used to treat symptoms of attention-deficit/hyperactivity disorder (ADHD), the most common neurobehavioral disorder of childhood. There are a few reported cases of overdose for suicide attempts or abuse with methylphenidate in current literature. Majority of these cases fully recovered after supportive therapy. We present a patient who ingested 3240 mg long acting methylphenidate for suicide attempt. He experi-enced increase in heart beat rate and blood pressure but he did not have additional symptoms. Although no serious neurological or cardiovascular event happened in this case, the supervised stimulant use is needed in child and adolescent population. Further studies are needed to evaluate the effect of methylphenidate overdose. 3240 mg uzun etkili metilfenidat alımı ile intihar giriĢimi ÖZET Çocukluk çağında en sık görülen nörodavranışsal bozukluk olan Dikkat Eksikliği Hiperaktivite Bozukluğunda gerekmektedir. (Anadolu Psikiyatri Derg 2014; 15(Ek sayı.1):S1-S3) Anahtar sözcükler: Metilfenidat, intihar girişimi, ters etkiler _____________________________________________________________________________________________________ INTRODUCTION