Prescription Archives Entry: Chalk Mixture (Mistura Cretae)
Prescribing Doctor: Drs. Garner & Swanton
Patient Name: Not listed
Pharmacy: Not specified (office above First National Bank, Traverse City, Michigan)
Date: Aug. 23, 1902
Location: Traverse City, Michigan
Transcription
℞
Chalk Mixture 3 oz
Sig: Take ½ teaspoonful every 2 hours until checked.
Interpretation
Chalk Mixture (Mistura Cretae) was a common early 20th-century remedy for diarrhea and stomach upset. The instruction “until checked” refers to taking the medicine until the condition was controlled.
Condition
Prescription paper in fair condition. Ink script is heavy and slanted but legible with effort. Edge stamp partially visible.
Historical Context
Chalk Mixture combined prepared chalk (calcium carbonate) with gum tragacanth (as a thickener) and cinnamon water (for flavor). It was often prescribed for diarrhea, indigestion, or “summer complaint” in children. Some formulations also included opium tincture for additional effect.
Curious Facts and Trivia
The term “until checked” reflects a symptom-driven approach, aiming to suppress diarrhea rather than address dehydration or infection.
Chalk Mixture was considered gentle enough for children, though opiated versions could be dangerously sedating.
It remained in U.S. and British pharmacopeias well into the 20th century before being phased out in favor of safer and more effective therapies.
Callout Box
⚠️ Caution: Opiated Chalk Mixture variants carried risks of sedation and dependency.
Why It’s in the Cabinet
This prescription demonstrates the reliance on simple mineral preparations for common complaints like diarrhea. Its survival offers a glimpse into small-town American practice in early 1900s Michigan.
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