Famotidine (Pepcid) dosing depends on why you’re taking it, whether it’s prescription or OTC, and your kidney function. Never exceed the product’s label or a doctor’s instructions, and get urgent help if you think you’ve taken too much.

Quick Scoop

  • For common heartburn/acid reflux in adults, typical oral doses are around 10–20 mg once or twice daily for short-term use, depending on the product. Many OTC labels cap at 2 doses in 24 hours unless a doctor says otherwise.
  • For ulcers or GERD prescribed by a doctor, doses are often 20–40 mg once or twice daily, usually for several weeks. These regimens are medical treatments and should only be adjusted by a clinician.
  • For rare “hypersecretory” conditions, specialists may use much higher doses (e.g., 20–60 mg every 6 hours, with manufacturer maximums up to 160 mg every 6 hours in severe cases), but this is hospital‑level care and not something to try on your own.

Safe use basics

  • Do not increase your dose or frequency on your own if regular-strength famotidine is not working; that can hide serious problems like ulcers, bleeding, or cancer.
  • People with kidney disease often need lower doses or less frequent dosing because famotidine is cleared by the kidneys.
  • Symptoms such as trouble swallowing, unintentional weight loss, vomiting blood, or black/tarry stools need immediate in‑person evaluation, not more famotidine.

If you think you took too much

  • Overdose signs can include confusion, severe dizziness, fast or irregular heartbeat, or fainting.
  • Emergency steps:
    • Call your local emergency number (e.g., 911 in the U.S.) or go to the ER.
* You can also contact Poison Control (in the U.S., 1‑800‑222‑1222) for real‑time guidance.

Why exact numbers are tricky here

Dosing ranges vary by country, product strength, age, weight, and other medications you take, and detailed, personalized limits require up‑to‑date medical and product information. Guidelines and labels also change over time, so the safest move is to follow the package directions and ask a pharmacist or doctor, especially if you feel you need more than the standard OTC dose.

Bottom line (non‑customized): Most adults using OTC famotidine for simple heartburn should stay at label doses (often 10–20 mg once or twice a day) and not exceed the labeled 24‑hour maximum unless a clinician explicitly tells them to.

Information gathered from public forums or data available on the internet and portrayed here.