Home › CFR › Title 21 › Part 29021 CFR Part 290 — Controlled DrugsSubpart A — General Provisions§ 290.1— Controlled substances.§ 290.2— Exemption from prescription requirements.§ 290.5— Drugs; statement of required warning.§ 290.6— Spanish-language version of required warning.§ 290.10— Definition of emergency situation.