Answer
Solid tetracycline preparations can lodge in and irritate the oesophagus. Water and an upright position help the capsule reach the stomach.
Sources for this answer
- Demeclocycline Hydrochloride 150mg Capsules — Current selected SmPCemc · Summary of Product Characteristics
General medicine information. Follow the instructions for your own medicine and speak to a pharmacist or clinician about your individual circumstances.