The injection would be given slowly into a vein, or added to an IV drip
However, self-prescribing is never a good idea
"Your firms corrective actions only included scrapping devices in inventory and increasing the cleaning frequency of the [redacted] machine to prevent excess silicone from migrating to the luer connector, despite receiving 221 complaints and filing 177 [medical device reports (MDR)] for the disconnection of the NAMIC Angiographic Control Syringes from manifolds which impact patients and clinicians, including one (1) MDR # 3015910259-2025-00109 involving the injection of air into a patient (Complaint # [redacted] dated [redacted]) and one (1) MDR # 3015910259-2024-00045 involving biohazard exposure of a clinician (Complaint # [redacted] dated [redacted])." Furthermore, Medline Industries was cited for other violations, including failing to maintain schedules for adjusting, cleaning, and performing other equipment maintenance to ensure compliance with manufacturing specifications

I certainly don't," Russell Wesdyk, associate director for Regulatory Affairs at the FDA's Center for Drug Evaluation and Research, said during the hearing
Medical-grade bacteriostatic water is produced under controlled conditions that ensure the benzyl alcohol concentration is precisely 0.9% the level that effectively inhibits bacterial growth without interfering with peptide stability