Sterile technique and safe handling
Why technique carries the risk
A compounded preparation has no preservative in most single-dose presentations, no approved labeling behind it, and frequently a short assigned beyond-use date. There is no downstream step that corrects a contamination introduced at the bedside. Everything below exists to protect three critical sites: the syringe tip, the needle hub, and the disinfected vial septum.
The preparation sequence
- Prepare the surface. Clear a dedicated, non-porous work surface. Wipe it with 70% isopropyl alcohol and let it dry. Keep paperwork, phones, and packaging off the prepared area.
- Hand hygiene. Wash for at least 20 seconds or use an alcohol-based rub, and let hands dry fully. Remove rings and wrist jewellery first; they hold organisms that hand rub does not reliably reach.
- Assemble before you open anything. Lay out the vial, diluent if reconstituting, alcohol pads, the correct syringe and needles, and a sharps container. Opening packaging mid-procedure is where most contamination happens.
- Inspect the vial. Check the label against the prescription, confirm the beyond-use date, and hold the vial to the light. Reject cloudiness, particulate, discolouration, or a damaged flip-cap or stopper.
- Disinfect the septum. Remove the flip-cap, swab the exposed stopper with a fresh alcohol pad using friction, and let it air dry. Never fan or blow on it.
- Draw without touching critical sites. The needle hub, syringe tip, and disinfected septum are critical sites. Nothing non-sterile touches them — including gloved fingers, the counter, and the outside of the packaging.
- Expel air and verify the dose. Hold the syringe vertically, tap the barrel, and expel air to the graduation you intend to give. Verify against the prescribed dose in the same units the syringe is calibrated in.
- Label and discard. If a syringe leaves your hand for any reason, it must carry contents, strength, patient, and time. Discard needles into a sharps container immediately — never recap by hand.
Choosing needles and syringes
Drawing
Use a wider gauge — commonly 18G to 21G — to withdraw from a stoppered vial, and change to a fresh needle before injection. Repeated septum punctures with the injection needle blunt the tip and can core the stopper, shedding rubber into the vial.
Injecting
Subcutaneous injections of small volumes are typically given with a short 29G to 31G needle on a U-100 insulin syringe, which is also what most peptide and GLP-1 dosing schedules are expressed against. Intramuscular administration needs a longer needle sized to the site and the patient's habitus. Match the syringe volume to the dose: measuring 8 units in a 1 mL barrel is far less accurate than in a 0.3 mL barrel.
Common errors and the correction
| Frequent error | Correct practice |
|---|---|
| Puncturing the septum while it is still wet with alcohol | Let it air dry — the disinfection happens during evaporation |
| Using the same needle to draw and to inject | Draw with a larger blunt or drawing needle, change to a fresh injection needle |
| Injecting diluent forcefully into a lyophilized cake | Aim the stream at the vial wall and let it run down; foaming denatures peptide |
| Shaking a reconstituted vial to speed dissolution | Swirl gently or leave it to stand; never shake |
| Recapping needles two-handed | Discard directly into sharps, or use a single-handed scoop if a cap is unavoidable |
| Storing a reconstituted vial without writing the date on it | Date and time every reconstitution at the moment it happens |
Multi-dose vials
A vial intended for more than one withdrawal is dated from first puncture, not from receipt. Write the puncture date and time on the vial the first time it is entered, disinfect the septum before every subsequent entry, and never return withdrawn product to the vial. If a multi-dose vial is carried into a treatment area where a patient has been prepared, it is dedicated to that patient from then on.
Sharps and waste
- Sharps container within arm’s reach before the first needle is uncapped.
- No hand recapping; no bending, shearing, or removing needles from syringes.
- Replace containers at the fill line — overfilling is a common source of injury.
- Follow state medical-waste rules for disposal and manifesting; they vary.
- Patients self-injecting at home need a written sharps plan and an approved container.
If technique is broken
Discard the syringe and start over — a suspect dose is cheaper to replace than to explain. For a needlestick, wash the site with soap and water, do not squeeze it, and follow your exposure protocol immediately; post-exposure decisions are time-sensitive. Document the event the same day.
Frequently asked
How long should a vial septum be swabbed before puncture?
Swab the septum with a fresh 70% isopropyl alcohol pad using firm friction, then allow it to air dry — typically about ten seconds. Alcohol disinfects as it evaporates, so puncturing a wet septum defeats the step and can carry alcohol into the vial.
Can a needle be reused on the same patient?
No. Needles and syringes are single-use devices. Reuse dulls and burrs the tip, increases injection trauma, and breaks the sterile barrier even when only one patient is involved.
Is it acceptable to pre-draw doses for later use?
Pre-drawing outside an ISO-classified environment shortens the assigned beyond-use date substantially and is governed by the dispensing pharmacy's labeling and USP chapters. Draw at the point of administration unless the labeling and your policy expressly permit otherwise.
What should be done with a vial that has a cracked stopper or visible particulate?
Quarantine it, do not administer, photograph the vial and label, and contact the dispensing pharmacy. Visible particulate, cloudiness in a solution expected to be clear, or a compromised closure are all rejection criteria on receipt inspection.