From London's Ghost Acres
Tin is most often used in solder with lead, and as a corrosive-resistant plating on steel or iron. It is also alloyed with copper to produce bronze or with lead, copper, and antimony to create pewter.
Tin in the chemical element with the symbol Sn. It is used in various industries and is not primarily used in medicine. https://en.wikipedia.org/wiki/Tin
Its medical uses as recorded in the Compendium and Pharmacopeia was for the expulsion of worms.
British Pharmacopoeia 1867
Predominately used as a test solution.
Preparations of Tin
Tin, Granulated / Test Solution 
- “grain tin, reduced to small fragments by fusing and pouring into cold water.”
Solution of Chloride of Tin / Test Solution
- Granulated Tin (1 oz), Hydrochloric Acid (3 fl oz), distilled water (as needed)
A Compendium of Domestic Medicine, 1865
Tin fillings are classified as an Anthelmintic (remedies which expel intestinal worms)
Diseases Treated with
- Worms: powdered tin is one of the worm medicines recommended to use in order to kill/dislodge the worms
Prescriptions Containing Tin
- Anthelmintic Electuary: powdered tin
- General Medical Council of Great Britain, British Pharmacopeia, (London: Spottiswoode & Co.,1867), 384 https://archive.org/details/britishpharmacop00gene
- GMCGB, 388
- Savory, John. A Compendium of Domestic Medicine (London: John Churchill and Sons, 1865), 286. https://books.google.ca/books?id=VxoDAAAAQAAJ&printsec=frontcover&source=gbs_ge_summary_r&cad=0#v=onepage&q&f=false
- Savory, 316