- MedlinePlus: Tramadol
 - Offers information about Tramadol or Ultram, the class of medications used to relieve moderate to moderately severe pain. - Drugs.com: Ultram (Tramadol)
- Basic overview of Ultram, also known as Tramadol is a narcotic pain reliever used to treat moderate to severe pain.
- WebMD: Ultram (Tramadol)
- Drug information about Ultram Oral, the brand name of tramadol hydrochloride used to relieve moderate pain.
- FDA: Ultram
(PDF) - Description of the chemical composition, pharmacodynamics, usage, indications, and contraindications of Ultram, a centrally acting synthetic opioid analgesic. In PDF format, from the U.S. Food and Drug Administration.
- HealthSquare: Ultram
- Provides information on Ultram including usage, dosage, side effects, and interactions.
- MedicineNet: Tramadol (Ultram)
- About the oral pain medication, Tramadol, or Ultram.
- RxList: Ultram (Tramadol)
- Provides dosage, drug interactions, and contraindications of tramadol hydrochloride tablets sold as Ultram.
- Ultram ER (Tramadol HCl Extended-Release Tablets)
- Information about Ultram and its use to treat moderate to moderately severe pain, from Ortho-McNeil Pharmaceutical.
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