Finding the correct Pepcid dosage chart by weight is essential for safely managing acid reflux or hives. As a pharmacist, I know that dosing Famotidine precisely ensures the best results for both children and adults. In this guide, you will find the complete Pepcid dosage chart by weight in both ml and mg.
How to Calculate Famotidine for Acid Reflux
“Pepcid is one of the most trusted H2 blockers for managing acid reflux in adults and children. It works by reducing the amount of acid your stomach produces, providing long-lasting relief from heartburn and indigestion.
For parents dealing with an infant or toddler who is struggling to feed or sleep due to “spit-ups,” this medication is often the first line of defense. If you want to understand the symptoms and natural management of this condition, make sure to read my Complete Guide to Pediatric Acid Reflux and GERD for expert pharmacist tips.”
Pediatric Pepcid Dosage Chart (Oral Suspension 40mg/5ml)
For infants and children, the standard concentration is usually 40 mg per 5 ml (which means 8 mg per ml). This chart uses the common pediatric dose of 0.5 mg/kg.
| Weight (kg) | Weight (lbs) | Dosage (ml) | Dosage (mg) | Frequency |
| 6 – 7 kg | 13 – 16 lbs | 0.4 ml | 3.2 mg | 1 to 2 times daily |
| 8 – 10 kg | 17 – 22 lbs | 0.6 ml | 4.8 mg | 1 to 2 times daily |
| 11 – 15 kg | 23 – 33 lbs | 0.8 ml | 6.4 mg | 1 to 2 times daily |
| 16 – 20 kg | 34 – 44 lbs | 1.1 ml | 8.8 mg | 1 to 2 times daily |
| 21 – 30 kg | 45 – 66 lbs | 1.5 ml | 12 mg | 1 to 2 times daily |
| 31 – 40 kg | 67 – 88 lbs | 2.2 ml | 17.6 mg | 1 to 2 times daily |
Pharmacist Tip: Always use the oral syringe provided with the medication to measure ml accurately. Household teaspoons are not precise enough for pediatric dosing.
Adult Pepcid Dosage Chart (Maximum Strength Tablets)
Adults and children over 40 kg (88 lbs) typically use the tablet form (10 mg or 20 mg).
| Weight (kg) | Weight (lbs) | Dosage (mg) | Format | Frequency |
| 41 – 60 kg | 89 – 132 lbs | 20 mg | 1 Max Strength tablet | Twice daily |
| 61+ kg | 133+ lbs | 20 mg – 40 mg | 1 to 2 Max Strength tablets | Twice daily |
Pepcid AC Maximum Strength Heartburn Relief Tablets, OTC Medicine Prevents & Relieves Heartburn & Acid Reflux Due to Acid Indigestion, 20mg Famotidine Acid Reducer, ICY Cool Mint, 40 ct
Dr. Marco Rollo, PharmD Clinical Pharmacist
“Dosing Pepcid correctly in children requires attention to detail. Transitioning from mg to ml can be confusing for parents, which is why I’ve created this weight-based chart. My goal is to bridge the gap between clinical pharmacology and your child’s comfort. If symptoms persist for more than two weeks, please consult your pediatrician to rule out more serious underlying conditions.
Disclaimer: This guide is for educational purposes. Famotidine suspension is often a prescription-only item in many regions. Never start a toddler on reflux medication without a formal diagnosis from a doctor.“