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The active ingredient in the proton pump inhibitor NEXIUM® (esomeprazole magnesium) Delayed-Release Capsules for oral administration and NEXIUM (esomeprazole magnesium) For Delayed-Release Oral Suspension is bis(5-methoxy-2-[(S)-[(4-methoxy-3,5-dimethyl-2- pyridinyl)methyl]sulfinyl]-1H-benzimidazole-1-yl) magnesium trihydrate. Esomeprazole is the S-isomer of omeprazole, which is a mixture of the S- and R- isomers. (Initial U.S. approval of esomeprazole magnesium: 2001). Its molecular formula is (C17H18N3O3S)2Mg x 3 H2O with molecular weight of 767.2 as a trihydrate and 713.1 on an anhydrous basis. The structural formula is:
The magnesium salt is a white to slightly colored crystalline powder. It contains 3 moles of water of solvation and is slightly soluble in water. The stability of esomeprazole magnesium is a function of pH; it rapidly degrades in acidic media, but it has acceptable stability under alkaline conditions. At pH 6.8 (buffer), the half-life of the magnesium salt is about 19 hours at 25°C and about 8 hours at 37°C.
NEXIUM is supplied in delayed-release capsules and in packets for a delayed-release oral suspension. Each delayed-release capsule contains 20 mg, or 40 mg of esomeprazole (present as 22.3 mg, or 44.5 mg esomeprazole magnesium trihydrate) in the form of enteric-coated granules with the following inactive ingredients: glyceryl monostearate 40-55, hydroxypropyl cellulose, hypromellose, magnesium stearate, methacrylic acid copolymer type C, polysorbate 80, sugar spheres, talc, and triethyl citrate. The capsule shells have the following inactive ingredients: gelatin, FD&C Blue #1, FD&C Red #40, D&C Red #28, titanium dioxide, shellac, ethyl alcohol, isopropyl alcohol, n-butyl alcohol, propylene glycol, sodium hydroxide, polyvinyl pyrrolidone, and D&C Yellow #10.
Each packet of NEXIUM For Delayed-Release Oral Suspension contains 2.5 mg, 5 mg, 10 mg, 20 mg, or 40 mg of esomeprazole, in the form of the same enteric-coated granules used in NEXIUM Delayed-Release Capsules, and also inactive granules. The inactive granules are composed of the following ingredients: dextrose, xanthan gum, crospovidone, citric acid, iron oxide, and hydroxypropyl cellulose. The esomeprazole granules and inactive granules are constituted with water to form a suspension and are given by oral, nasogastric, or gastric administration.
What are the possible side effects of esomeprazole (Nexium)?
Get emergency medical help if you have any of these signs of an allergic reaction: hives; difficulty breathing; swelling of your face, lips, tongue, or throat.
Stop using esomeprazole and call your doctor at once if you have symptoms of low magnesium such as:
- dizziness, confusion;
- fast or uneven heart rate;
- jerking muscle movements;
- jittery feeling;
- muscle cramps, muscle weakness or limp feeling;
- cough or choking feeling; or
- seizure (convulsions).
Less serious side effects may include:
What are the precautions when taking esomeprazole magnesium (Nexium)?
Before taking esomeprazole, tell your doctor or pharmacist if you are allergic to it; or to other PPIs (such as lansoprazole, omeprazole); or if you have any other allergies. This product may contain inactive ingredients, which can cause allergic reactions or other problems. Talk to your pharmacist for more details.
Before using this medication, tell your doctor or pharmacist your medical history, especially of: liver disease.
Some symptoms may actually be signs of a more serious condition. Tell your doctor immediately if you have: heartburn with lightheadedness/sweating/dizziness, chest pain or shoulder pain (especially with trouble breathing, sweating, lightheadedness, pain spreading to arms/jaw/neck/shoulders), unexplained weight loss.
Proton pump inhibitors...
Last reviewed on RxList: 1/7/2013
This monograph has been modified to include the generic and brand name in many instances.
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