OROS, (Osmotic-controlled Release Oral delivery System), is a controlled release oral drug delivery system in the form of a consumable capsule. The capsule has a rigid water-permeable jacket with one or more small holes. As the capsule passes through the body, the osmotic pressure of water entering the capsule pushes the active drug through the opening in the capsule.

OROS is a trademarked name owned by Alza Corporation.

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v • d • e Route of administrations / Dosage forms Oral Enteral/ digestive tract Solids Capsule · Pill · Tablet · Orally disintegrating tablet · Film · OROS (osmotic controlled release capsule) Liquids Elixir · Emulsion · Syrup · Suspension · Tincture Respiratory tract Inhaler (Metered-dose, Dry powder) · Nebulizer Circulatory system Sublingual administration ENT Eye drop · Ear drop · Intranasal Transdermal Emulsion (Ointment · Cream · Lotion · Liniment · Gel · Paste · Film)  · Medicated shampoo · Transdermal implant · Transdermal patch Injection/parenteral Subcutaneous (SC) · Intravenous (IV) · Intramuscular (IM) · Intraosseous · Intraperitoneal (IP) · Intrathecal · Intracavernosal Vaginal Pessary (vaginal suppository) · Vaginal ring · Douche · Intrauterine device Rectal Suppository · Enema