FDA Section 4 \u2022 who must NOT take this
Acyclovir - Contraindications
These conditions, allergies, and situations mean Acyclovir should NOT be used. From the US FDA-approved drug label Section 4.
CONTRAINDICATIONS Acyclovir tablets are contraindicated in patients who have had a demonstrated clinically significant hypersensitivity reaction [e.g., anaphylaxis, severe cutaneous adverse reactions (SCARs)] to acyclovir, valacyclovir, or any component of the formulation (see WARNINGS and ADVERSE REACTIONS ).