In children from 3 to 5 years of age, start with 2.5 mg daily; daily dosage may be raised in increments of 2.5 mg at weekly intervals until optimal response is obtained. In children 6 years of age and older, start with 5 mg once or twice daily; daily dosage may be raised in increments of 5 mg at weekly intervals until optimal response is obtained. Only in rare cases will it be necessary to exceed a total of 40 mg per day. Give first dose on awakening; additional doses (1 or 2) at intervals of 4 to 6 hours.

TAAR1 receptor activation was assayed in CHO cells stably expressing Gα16 and the hTAAR1 receptor. Cells were plated in HAM’s F-12 medium with 10% fetal bovine serum, 400 µg/ml hygromycin, and 400 µg/ml geneticin at 30,000 cells/well in 96-well, black, clear-bottom plates and incubated at 37 °C 5% CO2 overnight. Activation of hTAAR1 via LEVAMFETAMINE was assessed the next day using the Calcium 3 Assay Kit (Molecular Devices). On the day of assay, the culture medium was removed and the cells washed once in 100 µl HBSS buffer containing 0.78 mg/ml probenicid, followed by the addition of 100 µl HBSS buffer plus probenicid and 100 µl of Calcium 3 dye (one-third the suggested concentration). The cells were incubated with the dye at 37 °C for 1 h. LEVAMFETAMINE were evaluated using 10 different concentrations run in duplicate.