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Ritilan LA (methylphenidate hydrochloride) extended release capsules Pediatric Use Long-term effects of methylphenidate in children have not been well established. Ritalin LA should not be used in children under six years of age (see warnings). In a study conducted in young rats, methylphenidate was administered orally at doses of up to 100 mg/kg/day for 9 weeks, starting early in the postnatal period (Postnatal Day 7) and continuing through sexual maturity (Postnatal Week 10). When these animals were tested as adullts