This four-ounce amber glass bottle once contained Tincture No. 36 Digitalis, N.F., a potent cardiac stimulant produced by Eli Lilly & Company of Indianapolis. The label, printed in red and tan with the bold “POISON” warning across the top, identifies it as containing Digitalis purpurea extract in 73 percent alcohol—a preparation standardized for cardiac activity.

Digitalis was used to strengthen and slow the heartbeat in conditions such as congestive heart failure and atrial fibrillation. Its narrow therapeutic range made accurate dosing critical; overdoses could lead to nausea, visual halos, arrhythmias, and death.

This bottle carries the Lilly script logo and early product code AX-19608-D, consistent with mid-20th-century pharmaceutical packaging. Handwritten initials and dates suggest it was used in a clinical or dispensary setting, likely before tighter federal controls limited such formulations to hospital pharmacies.