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Can we give injection drotaverine in ns drip

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drotaverine injection IV infusion dilution normal saline compatibility

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drotaverine

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drotaverine hydrochloride injection 40 mg/2 ml intravenous slow administration dilution prescribing information

Short answer: It is usually given as a slow IV push, not as a drip. If an infusion is needed, dilute it in a small volume of NS. Normal saline is generally an acceptable diluent, but I couldn't find a manufacturer compatibility or stability statement for a long infusion.
What I found
  • The textbook library only covers drotaverine as a PDE4 inhibitor antispasmodic with no anticholinergic effects (Yamada's Textbook of Gastroenterology, 7th ed.). It has no IV administration details.
  • Product literature (e.g., Dro SPAZ leaflet) says the injection is given IM or IV. The usual adult dose is 40-240 mg/day in 1-3 IM doses. For biliary or renal colic the dose is 40-80 mg IV, alone or with analgesics.
  • One formulation source (a Russian patent text describing a drotaverine injection) says that when a quick effect is needed, 40-80 mg is given slowly IV in 10-20 mL of 0.9% sodium chloride. This is not a formal label, so treat it as supporting information only.
  • Regional leaflets (e.g., the MedEx listing for No-Spa) also describe slow IV injection for acute stone colic.
Practical points
  • Preferred method: Give the 2-4 mL (40-80 mg) ampoule slowly over several minutes, either undiluted or diluted in 10-20 mL NS, with the patient lying down. Rapid IV injection can cause hypotension, dizziness, flushing, palpitations and, rarely, collapse.
  • Piggybacking into a running NS drip: Pushing it slowly into the side port of a running NS line is a reasonable way to do this in practice.
  • Adding it to a 500 mL or 1 L bag: I found no reliable data on stability or compatibility for this, and it is not the labelled method. Avoid it unless your hospital pharmacy or the product insert specifically allows it.
  • Other fluids and drugs: Don't mix it in the same syringe or bag with other drugs. I couldn't verify compatibility with dextrose or other fluids.
  • Excipients: Some brands contain sodium metabisulfite and ethanol, so check for sulfite allergy.
  • Contraindications: Severe hepatic, renal or cardiac failure (low cardiac output syndrome), AV block, hypotension, and known hypersensitivity. Use caution in pregnancy.
Check the insert of the specific brand you have and your hospital's IV administration policy, because labelling differs between manufacturers and countries.
Recent evidence check: A PubMed search (last 2 years) found only a 2026 meta-analysis of drotaverine in labor for primigravidas (PMID 42791651). It doesn't address IV dilution or compatibility, and nothing I found contradicts the above.
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