Routes of administration: how delivery methods change psychoactive substance potency, duration, effects, and risks

Routes of administration strongly influence how quickly psychoactive substances take effect, how intense and long-lasting they feel, their bioavailability, and their risks. The reference explains oral, buccal, sublingual, nasal, inhaled, smoked, vaporized, injected, rectal, transdermal, and ocular routes. Intravenous injection produces the fastest rise in blood concentration, followed by smoking, suppository use, insufflation, and ingestion. It highlights route-specific hazards including gastrointestinal discomfort, oral and nasal tissue damage, lung injury, infectious disease transmission from shared equipment, burns from caustic compounds, overdose risk from poorly controlled vaporization, and complications from injection. Special attention is given to orally inactive DMT and 5-MeO-DMT, which may require MAO inhibitors for oral effects, creating potentially dangerous interactions. The page presents route choice as dependent on the substance, desired duration and potency, side effects, and personal comfort, while emphasizing safer-use considerations.