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We investigated the effects induced by a sensitizing dose (5 mg\/kg, i.p. per day for 5 days) of METH on rat behavior, DA transport by the DAT, DAT density, and inhibition of DA transport by METH in both the nucleus accumbens and striatum. We further investigated possible changes to glycosylation of the DAT after METH sensitization. The dosing paradigm caused an increased stereotyped response in rats treated with METH compared with saline controls. In animals treated with METH, DA transport velocities were increased by 6.4% in the nucleus accumbens and decreased by 21% in the striatum. Western blots demonstrated that DAT density was unchanged in the nucleus accumbens of METH\u2010treated animals, but striatal DAT density was decreased by 20%. Further studies investigating METH inhibition of DA transport found that in the nucleus accumbens of METH\u2010treated animals, the IC<jats:sub>50<\/jats:sub>was shifted to a larger value (from 0.81 to 1.45 \u03bcM). In the striatum, the IC<jats:sub>50<\/jats:sub>was decreased by 19% (from 1.00 to 0.81 \u03bcM) in METH\u2010treated animals. Studies using glycosidase treatments and Western blots revealed that glycosylation was effectively removed by<jats:italic>N<\/jats:italic>\u2010glycanase and neuraminidase, but not<jats:italic>O<\/jats:italic>\u2010glycosidase or \u03b1\u2010mannosidase. These studies also suggest that glycosylation was not altered in METH\u2010treated animals. This study demonstrates that in animals sensitized to METH, the DAT is differentially regulated in different areas of the brain important for drug abuse, and that DA transport changes induced by METH are not due to DAT density, but to changes in the kinetics of the DAT. Additionally, this study suggests that glycosylation may not play a role in DAT activity changes after METH exposure. 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