GI Bleeding & Varices: Two Different Bleeds, Two Different Drugs
Bleeding into the gut is a medical emergency, and the drug you reach for depends entirely on where it's coming from. A bleeding ulcer and bleeding varices look similar but need opposite-seeming treatments — one an acid blocker, the other a drug that squeezes the blood vessels. Knowing the difference is genuinely lifesaving.
Bleeding somewhere in the gut — showing up as vomiting blood, or passing black, tarry stools — is a serious emergency. Whatever the source, the first priority is always the same and comes before any specific drug: resuscitation. That means restoring the circulation with intravenous fluids and, if blood loss is severe, a blood transfusion — treating the shock before worrying about the source, exactly as you would for any major bleed. Once the patient is stabilised, the treatment splits sharply depending on WHERE the bleeding is coming from, because the two commonest serious upper-gut bleeds — a peptic ulcer and oesophageal varices — need quite different drugs.
Bleeding ulcer vs bleeding varices
One needs an acid blocker; the other needs to squeeze the vessels. A bleeding peptic ulcer is a raw sore that has eroded into a blood vessel. The main drug is a high-dose proton pump inhibitor (PPI): by strongly suppressing acid, it helps the blood clot over the ulcer stay stable (blood clots break down in an acidic environment), reducing rebleeding. The definitive treatment, though, is usually endoscopy — passing a camera down to find the bleeding point and stop it directly. Oesophageal varices are completely different. They're a complication of liver disease: when the liver is scarred (cirrhosis), blood backs up and forces open swollen veins in the wall of the oesophagus, which can rupture and bleed torrentially. Here a PPI is not the answer — the treatment is a drug that reduces the pressure and blood flow in those veins by constricting the splanchnic (gut) blood vessels: terlipressin (or octreotide). By squeezing down the flow into the varices, it reduces the bleeding. Antibiotics are also given, because infection is common and worsens outcomes in variceal bleeds. And, as with ulcers, the definitive treatment is endoscopic — banding the varices to stop them bleeding. So the same presentation — vomiting blood — demands you ask 'ulcer or varices?', because the answer changes the drug entirely: a PPI for the ulcer, terlipressin for the varices.
Preventing the bleed — and the recurring theme
There's also prevention to consider, which again differs by cause. For ulcers, prevention means addressing the causes from earlier — eradicating H. pylori and stopping or protecting against NSAIDs. For varices, there's an elegant preventive strategy that links back to the cardiovascular chapter: non-selective beta-blockers (like propranolol or carvedilol) are used to lower the pressure in the varices and reduce the risk of them bleeding in the first place. It's a lovely cross-connection — a heart drug repurposed to prevent a liver complication, by reducing blood flow into the swollen veins. The big lesson from this article is a general clinical principle: a symptom (here, bleeding) is not a diagnosis, and the right drug depends entirely on the mechanism behind it. Vomiting blood from an acid-eroded ulcer and vomiting blood from high-pressure varices look identical at the bedside but call for opposite treatments. Always ask what is actually causing the problem before choosing the drug — the same theme that ran through choosing antiemetics, treating ulcers, and dosing around the liver.
- GI bleeding is an emergency — resuscitate FIRST (IV fluids ± transfusion) before the specific drug.
- Bleeding ulcer → high-dose PPI (helps the clot stay stable) + endoscopy to stop it.
- Bleeding varices (liver disease) → terlipressin/octreotide (constrict gut vessels) + antibiotics + endoscopic banding.
- Prevent ulcer bleeds: eradicate H. pylori, address NSAIDs; prevent variceal bleeds: non-selective beta-blockers.
- The same symptom (vomiting blood) needs opposite drugs — ask ulcer or varices first.
GI bleeding is the clearest lesson in a principle that runs through all of medicine: the treatment depends on the mechanism, not the symptom. Two patients arrive vomiting blood, looking identical — but one is bleeding from an acid-eroded ulcer, where the answer is to shut off the acid with a PPI so the clot can hold; the other is bleeding from high-pressure varices caused by liver disease, where a PPI is useless and the answer is to squeeze down the blood flow with terlipressin. Give the ulcer drug to the varices patient and you've wasted precious time. This is why good clinicians resist the urge to treat the symptom directly and instead ask 'what's the actual mechanism here?' — the same discipline that told you to match an antiemetic to its receptor and to find an ulcer's true cause.
- Choosing the drug before resuscitating — restore the circulation (fluids/transfusion) first.
- Treating variceal bleeding with a PPI — it needs terlipressin/octreotide, not acid suppression.
- Forgetting antibiotics in variceal bleeding — infection worsens outcomes.
- Overlooking prevention: H. pylori/NSAIDs for ulcers, beta-blockers for varices.
A patient with liver cirrhosis is vomiting blood from oesophageal varices. Which drug is used?
- GI bleeding: resuscitate first (IV fluids ± transfusion), then treat by source.
- Bleeding ulcer → high-dose PPI (stabilises the clot) + endoscopy.
- Bleeding varices → terlipressin/octreotide (constrict gut vessels) + antibiotics + endoscopic banding.
- Prevent: H. pylori/NSAID care for ulcers; non-selective beta-blockers for varices. Mechanism, not symptom, picks the drug.
- Katzung BG. Basic & Clinical Pharmacology — GI bleeding & portal hypertension.
- Brunton LL, et al. Goodman & Gilman's The Pharmacological Basis of Therapeutics — Treatment of GI haemorrhage & varices.
- NICE / AASLD — Acute upper GI bleeding & variceal haemorrhage guidelines.
- Rang HP, Dale MM, et al. Rang & Dale's Pharmacology — Portal hypertension & vasoactive drugs.
