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5. Why Are My Stools Black? https://www.healthline.com/health/bloody-or-tarry-stools.
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10. Side Effects from NSAIDs. https://www.healthline.com/health/side-effects-from-nsaids.
11. Effects of Medications on the Stomach. https://www.verywellhealth.com/effects-ofmedications-on-the-stomach-1942950.
12. Coprescribing proton-pump inhibitors with nonsteroidal anti-inflammatory drugs: risks versus benefits. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5817415/.
13. Side effects. Antibiotics. https://www.nhs.uk/conditions/antibiotics/side-effects/.
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16. Steroid Side Effects: How to Reduce Drug Side Effects of Corticosteroids.
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18. Guidelines for prevention of NSAID-related ulcer complications.
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