Amphetamines (speed, Adderall, dexamphetamine) are detectable in urine for 2–4 days after use. In blood, they can be detected for up to 46 hours. Hair follicle tests detect amphetamine use for up to 90 days. Amphetamines are among the most commonly detected drugs in UK workplace testing.
Estimates only. Individual results vary based on metabolism, body weight, hydration, and frequency of use.