What is Nexium: Uses, Warnings & Interactions

Updated May 14, 2025  •  Published Dec 30, 2020

Nexium is a prescription delayed-release capsule or injection for people with serious gastrointestinal disorders such as GERD, erosive esophagitis, and ulcers. Its active ingredient is esomeprazole, a proton pump inhibitor (PPI) that reduces stomach acid production. It’s not to be confused with Nexium 24HR, an over-the-counter low-dose version of Nexium that helps people manage frequent heartburn.

Nexium overview

BRAND NAMES:

  • Nexium, Nexium I.V.

Generic Names:

  • Esomeprazole magnesium, esomeprazole sodium

Uses:

  • Treats gastroesophageal reflux disorder, duodenal and stomach ulcers, H. pylori infection, and overproduction of stomach acid

Therapeutic Classes:

  • Proton pump inhibitor, gastric acid secretion inhibitor, gastrointestinal agent

Forms:

  • Delayed-release capsule, granules, injection

How it’s taken:

  • By mouth, by intravenous injection

What is Nexium used for?

The FDA has approved prescription Nexium to treat gastroesophageal reflux disease (GERD), erosive esophagitis associated with GERD, H. pylori infection, and conditions that cause too much stomach acid (hypersecretory conditions). Nexium injections are FDA-approved to treat erosive esophagitis associated with GERD and to prevent bleeding in ulcer patients who have just undergone an endoscopy.

What form(s) does Nexium come in

  • Delayed-release capsule

    • 20 mg

    • 40 mg

  • Granules for oral suspension

    • 2.5 mg

    • 5 mg

    • 10 mg

    • 20 mg

    • 40 mg

  • Injection

    • 40 mg/vial

What are common Nexium doses?

  • For GERD:

    • In adults: 20 mg taken once per day for four weeks

    • In children 12–17 years of age: 20 mg taken once per day for four weeks

    • In children 1–11 years of age: 10 mg taken once per day for four weeks

  • For GERD-related erosive esophagitis:

    • In adults: 20–40 mg taken once per day for four to eight weeks

    • In children 12–17 years of age: 20–40 mg taken once per day for four to eight weeks

    • In children 1–11 years of age: 10–20 mg taken once per day for eight weeks

    • In children 1 month to 1 year of age: Dosage based on weight

  • For maintenance treatment of GERD-related erosive esophagitis in adults: 20 mg taken once per day

  • For H. pylori infection in adults: 20–40 mg taken once per day with antibiotics for 10–14 days

  • For hypersecretory conditions in adults: 40 mg taken once per day

  • For gastric ulcer prevention in adults on NSAID therapy: 20–40 mg taken once per day for up to six months

  • To reduce the risk of ulcer rebleeding in adults after an endoscopy examination: 80 mg intravenous infusion followed by a 71.5-hour intravenous infusion at 8 mg per hour

Find more detailed information about Nexium dosage, forms, and strengths here.

Common Nexium prescriptions

  • NexIUM
    10 capsules delayed release bottle

  • NexIUM
    30 capsules delayed release bottle

  • NexIUM
    60 capsules delayed release bottle

  • NexIUM
    90 capsules delayed release bottle

  • NexIUM
    20mg capsule delayed release

  • NexIUM
    40mg capsule delayed release

  • NexIUM
    10mg packet

  • NexIUM
    2.5mg packet

  • NexIUM
    20mg packet

  • NexIUM
    40mg packet

  • NexIUM
    5mg packet

How to take Nexium

  • Follow the prescriber’s instructions. Do not use more than directed or take doses more often than prescribed. Take all of the medicine in your prescription, even if you feel better after a few days.

  • Take Nexium capsules or oral suspension at least one hour before a meal. 

  • Some healthcare providers suggest the best time to take Nexium is in the morning before breakfast.

  • It is okay to take antacids with Nexium.

  • How to take Nexium capsules:

    • Swallow the capsule whole with a glass of water. Do not crush, break, or chew the capsule.

    • The delayed-release capsule can be opened, and the contents mixed into one tablespoon of applesauce. Do not mix the granules with any other type of food.

    • Stir the mixture well and swallow it right away. Do not chew. 

    • Throw away any remaining mixture.

    • The capsules can be mixed with water for use with a nasogastric feeding tube. Read the Instructions for Use that come with the medicine.

    • Store Nexium capsules in a tightly closed container at room temperature between 59° and 86°F.

  • How to take Nexium granules for oral suspension:

    • Mix the contents of a 2.5 mg or 5 mg packet with 1 teaspoon (5 mL) of water and stir well. 

    • Mix the contents of a 10 mg, 20 mg, or 40 mg packet with 1 tablespoon (15 mL) of water and stir well.

    • Ask a pharmacist how to mix multiple packets if that’s necessary.

    • Dose young children with the oral syringe. Older children or adults can take doses from a small glass or similar container.

    • Stir the mixture and allow it to thicken for two or three minutes.

    • Stir it again and drink the mixture within 30 minutes.

    • If it’s not taken within 30 minutes, throw it away and start a new mixture.

    • Add more water to any leftover medicine and drink it right away.

    • The mixture can be prepared for administration through a nasogastric feeding tube. Read the Instructions for Use that come packaged with the medicine.

    • Store Nexium packets unopened at room temperature (59° to 86°F).

What to do if you miss a dose of Nexium

  • If a dose is missed, take it when remembered.

  • If it’s the next day, skip the missed dose and take the next day’s dose as scheduled.

Nexium contraindications

  • This medicine is not right for everyone. 

  • Do not use it if you have had an allergic reaction to esomeprazole or similar medicines called proton pump inhibitors. You can find a complete list of PPIs here.

Nexium warnings

  • Tell any doctor or other healthcare provider who treats you that you are using this medicine.

  • Your doctor may need regular visits and lab tests to monitor treatment effectiveness and spot any side effects. Keep all appointments.

  • Before using prescription Nexium, make sure the prescribing healthcare provider knows if you are pregnant, breastfeeding, or if you have:

    • Liver problems

    • Low magnesium, low calcium, or low potassium levels

    • Kidney problems

    • Lupus

    • Osteoporosis

    • Vitamin B12 deficiency

  • Nexium can cause serious problems, including:

    • Kidney problems

    • Increased risk of fractures

    • Stomach growths

    • Lupus

  • This medicine can cause diarrhea up to two months after stopping Nexium. Call your doctor if the diarrhea becomes severe, does not stop, or is bloody. Do not take any medicine to stop diarrhea until you have talked to your doctor.

Nexium interactions

  • Because it reduces stomach acid, Nexium can make many drugs ineffective that rely on stomach acid to be broken down in the stomach. The list is long, so make sure the prescriber and the pharmacist know about all the prescription drugs being taken.

  • Nexium can also cause significant drug interactions with:

    • Blood thinners, particularly warfarin or clopidogrel

    • Drugs that make you pee

    • Drugs that treat HIV/AIDS or other viral infections, particularly ritonavir

    • Iron supplements

    • Cilostazol, citalopram, digoxin, methotrexate, rilpivirine, St. John’s wort, rifampin, tacrolimus, voriconazole

  • Nexium should only be used as needed. Long-term use of esomeprazole can cause serious problems including:

    • Low magnesium

    • Vitamin B12 deficiency

    • Osteoporosis

    • Increased risk of cancer

    • Kidney problems

    • Increased risk of dementia

    • Hair loss

  • Tell other healthcare providers you are using Nexium before they prescribe new medications.

Nexium side effects

Serious side effects

Talk to a doctor if you notice any signs or symptoms of a possible serious side effect, including:

  • Severe diarrhea that does not go away (up to two months after stopping Nexium)

  • Fever, joint pain, swelling in your body, unusual weight gain, changes in how much or how often you urinate

  • Stomach pain, nausea, vomiting, weight loss, bloody or black stools

  • Severe pain in the upper abdomen, tenderness, fever, racing heartbeats

  • Joint pain, rash on your cheeks or arms that gets worse in the sun

  • Blistering, peeling, red skin rash

  • Skin rash, fever, facial swelling, enlarged lymph nodes

  • Allergic reaction: Itching or hives, swelling in your face or hands, swelling or tingling in your mouth or throat, chest tightness, trouble breathing

Less serious side effects

  • Mild diarrhea, constipation, or gas

  • Headache

  • Injection site reactions (IV injection)

Find more detailed information about Nexium side effects here.

Sources:

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