Drugs Implicated in Peptic Ulcer Disease (Excluding H. pylori and NSAIDs)

Peptic ulcer disease (PUD) is most commonly caused by Helicobacter pylori infection and NSAID use. However, several other drug classes are also recognised causes of peptic ulceration independent of these two factors. The correct answer is 1, 2 and 3.

Evaluation of Each Drug

• 1. Clopidogrel: Although not a direct mucosal irritant like NSAIDs, clopidogrel is an antiplatelet agent that impairs platelet aggregation and inhibits angiogenesis/mucosal healing, thereby increasing the risk of peptic ulcers and GI bleeding, especially when ulcers are already forming. It is recognised as an independent risk factor for PUD and ulcer-related bleeding. Implicated.
• 2. Glucocorticoids: Corticosteroids reduce prostaglandin synthesis and impair mucosal defence and healing. While their ulcerogenic potential alone is modest, they significantly potentiate ulcer risk (particularly when combined with NSAIDs) and are a well-established cause of drug-induced peptic ulcers. Implicated.
• 3. Bisphosphonates: Oral bisphosphonates (e.g., alendronate) are well documented to cause upper GI mucosal injury, including esophagitis, gastritis, and peptic ulcers, due to direct local irritant contact with the mucosa. They are listed among drugs implicated in PUD. Implicated.
• 4. Colloidal bismuth subcitrate: This is not a causative agent but a therapeutic agent used to treat peptic ulcers. It works by forming a protective coating over the ulcer base, promoting healing, and (in combination regimens) helping eradicate H. pylori. It does not cause peptic ulcers. Not implicated.

Why the Other Options Are Wrong

• 2 and 4 only incorrectly includes colloidal bismuth subcitrate as a causative drug, when it is in fact a protective/therapeutic agent for PUD, and it wrongly omits clopidogrel and bisphosphonates, both of which are genuine risk factors.
• 1 and 2 only omits bisphosphonates, which are a recognised cause of drug-induced peptic ulceration.
• 1, 3 and 4 incorrectly includes colloidal bismuth subcitrate (a treatment, not a cause) and omits glucocorticoids, a well-established ulcerogenic drug class.

Conclusion

Clopidogrel, glucocorticoids, and bisphosphonates are all drugs implicated in peptic ulcer disease independent of H. pylori and NSAIDs, whereas colloidal bismuth subcitrate is a protective/curative agent used in ulcer treatment, not a causative one. Hence, option "1, 2 and 3" is the correct answer.