Pill-Induced Oesophagitis and Oesophageal Injury
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Direct answer
Pill-induced oesophagitis is mucosal injury caused by a tablet that lodges in the oesophagus and releases a damaging agent. Doxycycline, potassium chloride, alendronate and NSAIDs are classic culprits, and they cause retrosternal pain with odynophagia. Stopping the drug, healing the ulcer and teaching correct swallowing technique prevent recurrence.
What you must remember
- Commonest culprits: doxycycline and other tetracyclines, potassium chloride tablets, bisphosphonates such as alendronate, and NSAIDs.
- Mechanism: direct contact injury from a lodged tablet and local release of an irritant drug, rather than systemic toxicity.
- Classic site: the mid-oesophagus, where a tablet can be held up at points of compression such as the aortic arch and left atrium.
- Presentation: sudden retrosternal pain, odynophagia and dysphagia, often after a tablet taken at bedtime or without enough water.
- Risk factors: swallowing with little water, lying down soon after dosing, large tablets, and existing oesophageal narrowing or dysphagia in elderly patients.
- Endoscopy: discrete, well-defined ulcers, sometimes with a visible pill remnant, usually confirm the diagnosis.
- Prevention: take tablets upright with a full glass of water and stay upright for at least 30 minutes afterwards.
- Complications: stricture after deep ulceration, and rarely bleeding or perforation.
Managing a patient with suspected pill injury
A 71-year-old woman takes her weekly alendronate with a sip of water and lies down soon after. Three days later she has burning retrosternal pain and painful swallowing.
- Stop the culprit: The offending tablet is withdrawn, and a substitute is discussed with the prescriber where one exists.
- Confirm by endoscopy: Upper endoscopy shows discrete ulcers, often in the mid-oesophagus, which separates pill injury from reflux oesophagitis.
- Exclude mimics: Candida, herpes and CMV are considered when ulcers are atypical or the patient is immunocompromised.
- Relieve pain: Analgesia and soft food are used, and acid suppression or sucralfate may be added if pain persists.
- Teach safe dosing: Tablets are taken upright with a full glass of water, and the patient stays upright for at least 30 minutes afterwards.
- Watch for stricture: Dysphagia that persists after healing calls for repeat endoscopy and, if needed, dilatation.
Where the exam tries to catch you
Pill injury questions turn on the drug list and the posture advice.
- Trap: Blaming reflux for every drug-related retrosternal pain. Correct: Pill injury is a localised lesion caused by a drug and can occur without reflux.
- Trap: Continuing the culprit tablet after the diagnosis is made. Correct: Stopping or substituting the drug is the first step, and without it the ulcer does not heal.
- Trap: Missing alendronate in an older woman with odynophagia. Correct: Bisphosphonates are a classic exam culprit, and the advice to take them with plain water and stay upright is central.
- Trap: Assuming potassium chloride tablets are harmless because they are not caustic. Correct: Lodged potassium chloride tablets ulcerate the mucosa, so they are taken with water and in an upright position.
Frequently asked questions
Which drugs most commonly cause pill-induced oesophagitis?
Doxycycline and other tetracyclines, potassium chloride tablets, bisphosphonates such as alendronate, and NSAIDs are the drugs most frequently implicated in pill-induced oesophagitis. Each causes damage through direct contact when a tablet lodges in the oesophagus.
Why does alendronate cause oesophagitis more often than most tablets?
Alendronate can irritate the oesophageal mucosa directly, and the risk rises when the patient takes it lying down or without enough water. Patients are advised to take alendronate with plain water and remain upright afterwards.
Where in the oesophagus do pill ulcers usually lie?
Pill-induced ulcers commonly lie in the mid-oesophagus, at points where a tablet can be held up by the aortic arch or the left atrium. This distribution helps distinguish them from reflux-related injury in the lower oesophagus.
How can pill-induced oesophagitis be prevented?
Pill-induced oesophagitis is prevented by taking tablets upright with a full glass of water and staying upright for at least 30 minutes afterwards. Patients should also avoid bedtime dosing of drugs known to cause oesophageal injury.