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Bacteriostatic Water research

What published studies found for Bacteriostatic Water: 9 papers, 4 in humans, with sample sizes and key results, plus 1 registered clinical trials.

B
Some human evidence
Why: Two RCTs (475 people) used benzyl-alcohol-preserved saline as a skin anaesthetic, not as a diluent; its harms come from neonatal case reports and cell studies.

Bacteriostatic water is sterile water with about 0.9% benzyl alcohol added as a preservative. At the volumes used to reconstitute injections it is well tolerated in adults - it even slightly numbs the skin - but benzyl alcohol caused fatal 'gasping syndrome' in premature newborns given flush volumes in the 1980s, and it is a recognised contact allergen and locally toxic to eye tissue.

✓ 3 positive✗ 5 negative~ 1 mixed

Benzyl alcohol should not be used in neonates or for intrathecal and intraocular routes, and total benzyl alcohol dose matters in small bodies; adult reconstitution volumes are far below the amounts implicated in the neonatal deaths.

Browse and filter these papersBacteriostatic Water prices and vendors

Reported side effects

Registered clinical trials

1 trials of Bacteriostatic Water on ClinicalTrials.gov: 0 active, 1 completed. Registered trials include ones that haven't published yet.

TrialStatusPhasePeopleSponsor
Hemostatic Effect of Intrauterine Instillation of Oxytocin in Hysteroscopic MyomectomyNCT04996498 · started 2021-04-15Completed–60Ain Shams Maternity Hospital

All 1 Bacteriostatic Water trials, with countries and recruiting status

Human studies

~ Mixedhuman RCTJ Perianesth Nurs · 2012

Bacteriostatic normal saline compared with buffered 1% lidocaine when injected intradermally as a local anesthetic to reduce pain during intravenous catheter insertion.

n = 376 humansDouble-blinded randomized experimental design

In 376 surgical patients, intradermal bacteriostatic saline with 0.9% benzyl alcohol produced the same injection pain as buffered 1% lidocaine but slightly higher pain during the subsequent IV insertion (p=0.025).

Key resultIV pain scores were lower with buffered 1% lidocaine than bacteriostatic saline (P=.025); no difference in intradermal pain scores (P=.792)
Studied
Presurgical patients undergoing IV catheter insertion
Compared with
Buffered 1% lidocaine
Main outcome
Pain score (10-point numeric rating scale)
Sample
376 presurgical patients randomized
Authors' conclusion
Buffered 1% lidocaine was more effective than bacteriostatic normal saline in reducing pain during IV catheter insertion.
PubMed 23164205DOI
✓ Positivehuman RCTPediatr Emerg Care · 1998

Saline with benzyl alcohol as intradermal anesthesia for intravenous line placement in children.

99 children, 33 per groupProspective randomized clinical trial

In 99 children randomized to intradermal saline with 0.9% benzyl alcohol, intradermal lidocaine or no anaesthetic before IV placement, median pain was 9 mm for the preserved saline versus 41 mm with no anaesthetic and 10 mm with lidocaine.

Key resultMedian pain 41.0 mm (no anesthetic), 9.0 mm (saline with benzyl alcohol), 10.0 mm (lidocaine); P = 0.006 saline vs nonanesthetic, P = 0.57 saline vs lidocaine
Studied
Children over 6.8 years old in an urban pediatric emergency department needing i.v. placement
Compared with
Intradermal lidocaine or no anesthesia
Main outcome
Pain of entire i.v. placement procedure (visual analog scale)
Authors' conclusion
Saline with benzyl alcohol and 1% lidocaine are equally effective as intradermal anesthetics for i.v. placement in children, and both more effective than no anesthesia.
Limitations
Convenience sample.
PubMed 9583393DOI
✗ Negativehuman trialDev Pharmacol Ther · 1988

Benzyl alcohol metabolism and elimination in neonates.

14 term and 9 preterm neonatesPharmacokinetic study of benzoic and hippuric acid levels

In 14 term and 9 preterm neonates given phenobarbital containing benzyl alcohol, preterm infants accumulated far more benzoic acid in serum (peak 2130.6 vs 237.8 kg/l) and excreted less hippuric acid, showing immature detoxification.

Key resultNormalized peak benzoic acid was higher in preterm than term neonates (2130.6 vs. 237.8 kg/l, p less than 0.001); normalized AUCIV 1,253.2 vs. 483.0 kg.h/l (p less than 0.01)
Studied
Term and preterm neonates receiving phenobarbital loading doses containing benzyl alcohol
Compared with
Term vs preterm neonates
Main outcome
Serum and urine benzoic and hippuric acid
Authors' conclusion
Hippuric acid formation is deficient in preterm neonates, confirming immature benzoic acid detoxification. The authors could not directly answer the safety of low benzyl alcohol doses.
Limitations
No toxic signs of the benzyl alcohol syndrome were seen, so low-dose safety is unresolved.
PubMed 3229281DOI
✓ Positivehuman trialAANA J · 1998

Intradermal bacteriostatic 0.9% sodium chloride containing the preservative benzyl alcohol compared with intradermal lidocaine hydrochloride 1% for attenuation of intravenous cannulation pain.

40 adult presurgical patients, own controlsWithin-patient comparison (each patient served as own control)

In 40 presurgical patients acting as their own controls, intradermal bacteriostatic 0.9% sodium chloride with benzyl alcohol relieved cannulation pain as well as 1% lidocaine.

Key resultNo significant difference in perceived cannulation pain between pretreatments
Studied
Adult presurgical patients requiring two large bore IV catheters
Compared with
Intradermal lidocaine hydrochloride 1%
Main outcome
Pain of IV cannulation (visual analogue scale)
Authors' conclusion
Intradermal bacteriostatic 0.9% sodium chloride with benzyl alcohol appears as effective as intradermal lidocaine 1% in attenuating IV cannulation pain.
PubMed 10488265

Reviews

✓ PositivereviewEye (Lond) · 2022

Bacteriostatic preserved saline for pain-free periocular injections: review.

62 studies identified on preserved saline since 1928Literature review

A review of 62 studies of benzyl-alcohol-preserved saline for periocular injections found lower injection pain in five studies and very low infection rates, supporting its use as a diluent.

Studied
Literature on benzyl alcohol-preserved saline for periocular injections
Main outcome
Injection pain and bacteriostatic properties
Authors' conclusion
Preserved saline reduces pain of periocular botulinum toxin and local anaesthetic injections versus unpreserved saline, with minimal reported complications; lidocaine solutions are more effective for IV catheter insertion pain.
Limitations
Narrative literature review.
PubMed 35017698DOIFree full text
✗ NegativereviewDermatitis · 2026

Benzyl Alcohol: Allergen of the Year 2026.

No new dataNarrative review / awareness statement

Benzyl alcohol was named Allergen of the Year 2026 by the American Contact Dermatitis Society; it can cause allergic contact dermatitis with repeated exposure and is missing from many standard patch-test series.

Authors' conclusion
Benzyl alcohol can cause allergic contact dermatitis, particularly with prolonged or repeated exposure, and is not in many standard patch test series; it was named 2026 Allergen of the Year.
Limitations
No original data.
PubMed 41649135DOI

Human studies

✗ Negativecase reportN Engl J Med · 1982

The gasping syndrome and benzyl alcohol poisoning.

HumansReport (no abstract available)

The report linking the neonatal gasping syndrome to benzyl alcohol poisoning, the observation that led to benzyl-alcohol-preserved flushes being withdrawn from newborn care.

Authors' conclusion
No abstract is available; per its title the paper concerns the gasping syndrome and benzyl alcohol poisoning.
Limitations
No abstract available to verify details.
PubMed 7133084DOI

Animal & lab studies

✗ Negativein vitroExp Eye Res · 2008

In vitro benzyl alcohol cytotoxicity: implications for intravitreal use of triamcinolone acetonide.

Cells / labIn vitro cytotoxicity study5 to 120 min exposures

In cultured human and rabbit retinal pigment epithelial cells, benzyl alcohol at the concentration found in commercial triamcinolone suspensions (9 mg/mL) killed cells within 5 minutes by necrosis, and 0.225 mg/mL impaired function at 2 hours.

Key resultBA 0.225mg/mL impaired human RPE cell function at 2h; 0.0225mg/mL did not; 9.0mg/mL was toxic within 5min
Studied
Human ARPE-19 and rabbit retinal pigment epithelial cells
Compared with
Balanced salt solution control
Main outcome
RPE cell death and function
Authors' conclusion
Benzyl alcohol at concentrations in commercial triamcinolone suspensions can damage RPE cells; the authors suggest removing the vehicle before intravitreal use.
Limitations
In vitro study.
PubMed 18420195DOI
✗ Negativein vitroAm J Hosp Pharm · 1988

Incompatibility of ifosfamide with benzyl-alcohol-preserved bacteriostatic water for injection.

No new dataReport (no abstract available)

Ifosfamide is chemically incompatible with benzyl-alcohol-preserved bacteriostatic water for injection, so the diluent is not interchangeable with plain sterile water for every drug.

Authors' conclusion
No abstract is available; per its title the paper reports an incompatibility of ifosfamide with benzyl-alcohol-preserved bacteriostatic water for injection.
Limitations
No abstract available to verify details.
PubMed 3369469

Verdicts are judged on each paper's own main outcome; grades run from A (strong human evidence) to D (little or none). Details are read from the abstracts, and figures are reproduced only from openly licensed full texts. Not medical advice.