Tramadol (INN) (IPA: ) is an atypical opioid which is a centrally acting analgesic, used for treating moderate to severe pain. It is a synthetic agent, unrelated to other opioids, and appears to have actions on the GABAergic, noradrenergic and serotonergic systems. Tramadol was developed by the German pharmaceutical company Grünenthal GmbH and marketed under the trade name Tramal. Grünenthal has also cross licensed the drug to many other pharmaceutical companies that market it under various names, some of which are listed below.

Tramadol is available in both injectable (intravenous and/or intramuscular) and oral preparations. It is usually marketed as the hydrochloride salt (tramadol hydrochloride).

Dosages vary depending on the degree of pain experienced by the patient. Tramadol is approximately 10% as potent as morphine, when given by the IV/IM route. Oral doses range from 50–400 mg daily, with up to 600 mg daily when given IV/IM.