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Medications That Contribute to Hemorrhoids

Medications That Contribute to Hemorrhoids

Several common medications can contribute to hemorrhoid risk or worsen existing symptoms — mainly through causing constipation, or through effects on bleeding. None of this is a reason to stop a prescribed medication on your own; it’s context for a conversation with the prescriber if hemorrhoid symptoms are a recurring issue.

Key takeaways
  • Opioid pain medications are among the most significant contributors, through their well-known constipating effect.
  • Iron supplements, commonly used in pregnancy and for anemia, are a frequent and often overlooked cause of constipation.
  • NSAIDs and blood thinners don’t cause hemorrhoids directly but can increase bleeding from hemorrhoids that are already present.
  • Never stop a prescribed medication without talking to the prescriber — the underlying condition being treated usually matters more than the hemorrhoid side effect.

Medications linked to constipation (and therefore straining)

  • Opioid pain medications — one of the most well-established causes of medication-related constipation, sometimes severe, due to their direct effect on gut motility
  • Iron supplements — commonly prescribed for anemia or in pregnancy, frequently cause constipation as a side effect
  • Certain antidepressants and anticholinergic medications — can slow gut motility in some people
  • Calcium supplements, particularly at higher doses, can contribute to constipation for some people
  • Some blood pressure medications, including certain calcium channel blockers, can cause constipation as a side effect for some people (notably, topical calcium channel blockers are also used to treat anal fissures — a different use and route of administration than oral blood pressure medication)

Medications linked to increased bleeding risk

  • NSAIDs (ibuprofen, naproxen, aspirin) — don’t cause hemorrhoids, but their effect on platelet function and the stomach/gut lining can increase bleeding from hemorrhoids that are already present, which is part of why they’re specifically discouraged when active rectal bleeding is a concern (see Rectal bleeding: what it can mean)
  • Blood thinners (anticoagulants), prescribed for various cardiovascular conditions, similarly increase bleeding risk from existing hemorrhoids without causing them directly

What to do with this information

  • Don’t stop a prescribed medication on your own — the condition it’s treating (pain control, blood clot prevention, anemia correction) generally matters more than a hemorrhoid side effect, and abruptly stopping some of these medications can be harmful
  • Mention hemorrhoid symptoms to the prescriber, especially for ongoing medications like opioids or iron — there may be a way to manage the constipating side effect (stool softeners, adjusted dosing) without changing the main medication
  • If you’re on a blood thinner or regular NSAID and notice new or worsening rectal bleeding, this is worth a direct conversation with a doctor rather than assuming it’s simply “worse hemorrhoids because of the medication” — the same red flags apply regardless of what medications you’re taking

When to see a doctor

  • New or worsening hemorrhoid symptoms after starting a new medication
  • Any bleeding that seems disproportionate, especially while on a blood thinner
  • Constipation related to a necessary ongoing medication that isn’t improving with basic measures
Want the broader picture of what contributes to hemorrhoid risk? See Why do hemorrhoids happen?

This page is for general education and isn’t a substitute for medical advice. Never stop or change a prescribed medication without talking to the prescriber first.