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Oral effects don’t appear instantly because the drug must travel through the digestive system, be dissolved, and be absorbed into the bloodstream before it can reach the brain. This process takes time, so the typical onset for an orally ingested drug is about 15–30 minutes. The exact timing can shift based on factors like whether you took the drug with food, the formulation (tablet, capsule, or liquid), and individual differences in gastric emptying and intestinal absorption. While shorter onsets (5–10 minutes) would be unusual for oral dosing and faster routes like inhalation or injection produce quicker effects, longer delays (1–2 hours or more) can occur with slow-dissolving forms or if food slows absorption.