Treatment admissions for addiction to methamphetamine and prescription drugs are increasing even as fewer Americans are seeking treatment for heroin and cocaine addiction, according to a new report from the Substance Abuse and Mental Health Services Administration (SAMHSA).

Findings from SAMHSA's Treatment Episode Data Set (TEDS) report indicate a "sharp" rise in treatment requests by users of methamphetamine, other amphetamines, and narcotic pain medications between 2004 and 2005. Meth treatment admissions rose 12 percent in a single year and were up 172 percent over the decade.

Admissions for treatment of prescription drugs like codeine, hydrocodone, hydromorphone, morphine, and oxycodone increased 9 percent between 2004 and 2005, and more than 300 percent since 1995. "Based on these findings, we can anticipate a growing demand over the next several years for treatment services that address prescription drug misuse," said SAMHSA Administrator Terry Cline, Ph.D.

For the first time in six years, there were fewer heroin admissions than admissions to treatment for cocaine addiction, the TEDS study showed. Treatment admissions for marijuana declined slightly between 2004 and 2005.