Medicaments classification: Heparin injection treated as a medicament for tariff purposes, not a patent medicine, for excise. Heparin injection, prepared by dissolving Heparin Sodium into a preservative solution and supplied in unbranded vials, was examined and found to function as a medicament for prophylaxis and treatment of thromboembolic conditions; chapter notes exclude such medicaments from the chemical substance heading and the absence of identifying marks on the container means it does not qualify as a patent or proprietary medicine, supporting its classification under the tariff entry for medicaments.