Which of the following is NOT a high‑risk substance?

• A. Cytotoxic medicines
• B. Hormones
• C. Oil-based vaccines
• D. Antibiotics

Answer: (D)

The main idea here is safety classification: some medicines are considered high‑risk for handling because they can cause serious harm to staff or patients if there’s exposure or misuse, while others are managed with standard precautions.

Cytotoxic medicines are high‑risk because they target rapidly dividing cells and can cause serious toxicity, reproductive harm, or mutagenicity if workers are exposed. They require stringent containment, protective gear, and dedicated handling procedures to prevent spills or inhalation.

Hormones are high‑risk since systemic exposure can disrupt endocrine balance, affect reproduction, or cause metabolic issues. Handling them safely involves careful storage, dosing accuracy, and appropriate protective measures to minimize accidental exposure.

Oil‑based vaccines carry risk related to their adjuvants, which can provoke strong local or systemic reactions and complicate handling and administration. Because of potential tissue irritation and reactions to components, they are treated with more cautious handling practices.

Antibiotics, while essential and needing proper stewardship and safe administration, do not carry the same level of occupational hazard as the other categories when considering typical handling risks. They’re managed with standard pharmacy safety precautions rather than the specialized containment used for cytotoxic drugs, hormones, or oil‑based vaccine preparations.

Therefore, antibiotics are not considered a high‑risk substance in this context.