Isoniazid — all forms, strengths & imprints

Our FDA label database records 7 distinct pills for Isoniazid across 2 strength(s). The same medicine made by different companies carries different imprints and often looks completely different — that is normal for generics. Rows with a link have a full identification page in the current wave.

Imprint	Medicine & strength	Colour	Shape	Size	Labeler
B 066 100	Isoniazid 100 mg	White	Round	9 mm
E 4354	Isoniazid 100 mg	White	Round	8 mm
WESTWARD 260	Isoniazid 100 mg	White	Round	8 mm
B 071 300	Isoniazid 300 mg	White	Oval	18 mm
E 4350	Isoniazid 300 mg	White	Round	11 mm
G L 03	Isoniazid 300 mg	White	Oval	18 mm	Remedyrepack Inc.
LAN 1109	Isoniazid 300 mg	White	Round	10 mm

Equivalents note: pills in this list that share the same strength contain the same active ingredient at that strength. They are listed for identification only — this is not a suggestion to substitute one product for another.

Source: FDA label data via DailyMed/openFDA, export of October 29, 2026.