Diatrizoic Acid (76%) is a high-osmolality, ionic, iodinated contrast medium used for radiographic imaging. It contains 76% w/v of the meglumine salt of diatrizoic acid, equivalent to approximately 370 mg Iodine per mL. It is primarily used for intravascular administration in procedures like urography, angiography, and computed tomography (CT) to enhance the visibility of vascular structures and organs. Its use has declined in favor of lower-osmolality agents but remains relevant in specific procedures and cost-sensitive settings in India.
Adult: Dose varies by procedure. **Examples:** IV Urography: 25-50 mL (approx. 9-18.5g iodine). Angiography: Varies by vessel, typically 10-40 mL per injection. CT: 50-150 mL (dose based on 1-2 mL/kg). **ALWAYS refer to specific procedure protocols.**
Note: For intravascular use only. Must be administered by a trained physician in a setting with resuscitation facilities. Usually injected intravenously or intra-arterially via a power injector or hand syringe. Warm to body temperature before use to reduce viscosity. Observe patient closely for at least 30 minutes post-injection. Do not mix with other drugs in syringe or infusion line.
Diatrizoic acid is a radiopaque substance that attenuates X-rays. Its high iodine content (approximately 37% by weight in the 76% formulation) absorbs X-rays more effectively than surrounding tissues. When injected into blood vessels, body cavities, or ducts, it creates a density difference, making these structures visibly brighter (white) on radiographic images.
Pregnancy: **Category D (as per some older classifications).** Iodinated contrast crosses the placenta and can depress fetal thyroid function. Use only if absolutely essential for maternal diagnosis, after first trimester. Fetal thyroid function should be monitored postnatally if used.
Driving: Patients may experience vasovagal reactions, dizziness, or nausea. They should be advised not to drive or operate machinery until fully recovered, usually for 24 hours post-procedure.
| Metformin | Risk of lactic acidosis if contrast-induced nephropathy occurs. Must be stopped prior to procedure and resumed only after renal function is confirmed normal. | High |
| Beta-blockers (e.g., Propranolol) | May mask tachycardia as a sign of hypersensitivity and impair response to epinephrine. | Moderate |
| Interleukin-2 | Increased risk of delayed hypersensitivity reactions. | Moderate |
| Other Nephrotoxic drugs (Aminoglycosides, NSAIDs, Amphotericin B) | Additive risk of acute kidney injury. | High |
| Diuretics (especially Loop diuretics) | May exacerbate dehydration and increase risk of nephrotoxicity. | Moderate |
Same composition (Diatrizoic Acid (76%)), different brands: