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Fluoritalin is 4F-MPH, or 4-Fluoromethylphenidate. Fluoritalin is stronger than Ritalin and is fluorinated Ritalin. Oral Dosage Threshold < 5 mg Light 5 - 10 mg Common 10 - 15 mg Strong 15 - 20 mg Heavy 20 mg + Duration Total 4 - 8 hours Onset 30 - 60 minutes Peak 2 - 4 hours Offset 1 - 2 hours After effects 5 - 10 hours
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