Gastroesophageal reflux disease (GERD) affects about 20% of people in the United States.
It’s more than just heartburn or acid reflux after one meal.
GERD is a chronic, painful digestive condition that leads to health complications over time.
Prevacid and Prilosec are two medications commonly used to treat symptoms of GERD.
In this article, we’ll explore the similarities and differences between these medications, as well as common side effects, drug interactions, and important warnings to be aware of.
Prevacid vs Prilosec
Prevacid (the brand name for lansoprazole) and Prilosec (the brand name for omeprazole) are available over the counter or, if a higher dosage is needed, with a prescription.
Uses
Prevacid and Prilosec are both proton pump inhibitors (PPIs).
They work to reduce symptoms of GERD and acid reflux by blocking how much acid the stomach produces.
The U.S. Food and Drug Administration (FDA) has approved these medications for the same uses:
Gastroesophageal reflux disease (GERD)
Esophagitis
Zollinger-Ellison syndrome
Systemic mastocytosis
Duodenal and gastric ulcers
Similarities
Prevacid and Prilosec have many similarities.
Drug class: Prevacid and Prilosec are proton pump inhibitors. They work similarly to decrease acid in the stomach.
Conditions treated: Both are approved for treating the same conditions, as above.
Time to take effect: Prevacid takes effect around 1-3 hours after it is taken, with rapid absorption after the medicine leaves the stomach. Prilosec is rapidly absorbed as well. Prilosec may take 1-4 days before the full effect is achieved, and Prevacid may take up to 4 days.
Length of treatment: Prevacid is typically prescribed or recommended for 10 days or up to 12 weeks, although some patients may prescribed longer courses. Prilosec is typically prescribed or recommended for 10 days or up to eight weeks, although it may be used longer in some cases.
Differences
Although Prevacid and Prilosec are similar in many ways, they have a few differences:
Dosages: Follow dosing instructions for the medication you are taking. Prevacid is typically 15-30 milligrams (mg), one or two times per day. Prilosec is typically 20-40 mg, one or two times per day.
Forms: Prilosec is available as a pill or a powder. Prevacid is available as an extended-release tablet, a dissolving tablet, and a liquid.
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Common Side Effects
Prevacid and Prilosec can each cause some side effects, as listed below.
Prevacid
Flatulence
Acid regurgitation
Prilosec
Headache
Weakness
Diarrhea
Abdominal pain
Flatulence
Acid regurgitation
Decreased appetite
Upper respiratory tract infections
Drug Interactions
Prevacid and Prilosec also both have potential drug interactions, as noted below.
Prevacid
Calcium carbonate
Iron salts
Itraconazole
Atazanavir
Ampicillin
Warfarin
Sucralfate
Red yeast rice
St. John’s wort
Loop/thiazide diuretics
H2 blockers or other antacid medications
Methotrexate
Prilosec
Ampicillin
Calcium carbonate
Vitamin B12
Cyclosporine
Diazepam
Digoxin
Disulfiram
Flurazepam
Gefitinib
Indinavir
Iron salts
Ketoconazole
Phenytoin
Triazolam
Warfarin
Citalopram
Methotrexate
Plavix
St. John’s wort
Is Prevacid or Prilosec More Effective?
Prevacid and Prilosec are equally effective for the conditions they are approved to treat.
A double-blind study of 3,510 patients compared the two drugs’ effectiveness for heartburn relief.
Prevacid was slightly more effective at relieving severe heartburn symptoms, but at the end of eight weeks, both medications performed the same.
Additionally, a meta-analysis of different PPIs found that all are comparable, and taking the right dose matters more than which medication you take for the effectiveness of a treatment.
A healthcare provider can help determine which medication might work best for your health and medical needs.
Warnings
Because Prevacid and Prilosec are in the same drug class, they have similar warnings.
Taking either one for a prolonged period of time can result in potentially serious health conditions, including:
Clostridium difficile diarrhea
Bone fracture
Cutaneous lupus erythematosus
Systemic lupus erythematosus
Vitamin B12 deficiency
Acute interstitial nephritis (a serious kidney condition)
Serious magnesium deficiency
Both drugs may increase the risk of false-positive results when testing for neuroendocrine tumors.
Women who are pregnant or breastfeeding should speak with their healthcare provider before taking Prevacid or Prilosec.
People who have osteoporosis should not take these drugs, as they increase the risk of serious bone fractures.
Talk to a doctor online
Refill medications and get certain necessary prescriptions.
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How K Health Can Help
Did you know you can get affordable primary care with the K Health app? Download K Health to check your symptoms, explore conditions and treatments, and if needed text with a healthcare provider in minutes. K Health’s AI-powered app is based on 20 years of clinical data.