This study will test the ability of a medicine (Quetiapine) that is used to treat
schizophrenia or bipolar disorder to reduce the effects of methamphetamine that make it
difficult for users to stop using it. This study will test the ability of a medicine that is
used to treat schizophrenia or bipolar disorder to reduce the effects of methamphetamine that
make it difficult for users to stop using it. The investigator thinks quetiapine will lessen
the effects of methamphetamine.