Medically reviewed on June 25, 2018
What is Prevacid OTC?
Prevacid OTC is a proton pump inhibitor. This medicine decreases the amount of acid produced in the stomach.
Prevacid OTC is used to treat and prevent stomach and intestinal ulcers, erosive esophagitis (damage to the esophagus from stomach acid), and other conditions involving excessive stomach acid such as Zollinger-Ellison syndrome.
Over-the-counter Prevacid OTC (Prevacid OTC) is used to treat frequent heartburn that happens 2 or more days per week.
Prevacid OTC is not for immediate relief of heartburn symptoms.
Prevacid OTC may also be used for purposes not listed in this medication guide.
Prevacid OTC can cause kidney problems. Tell your doctor if you are urinating less than usual, or if you have blood in your urine.
Diarrhea may be a sign of a new infection. Call your doctor if you have diarrhea that is watery or has blood in it.
You may be more likely to have a broken bone while taking Prevacid OTC long term or more than once per day.
Before taking this medicine
Heartburn can mimic early symptoms of a heart attack. Get emergency medical help if you have chest pain that spreads to your jaw or shoulder and you feel anxious or light-headed.
Tell your doctor if you have ever had:
low levels of magnesium in your blood; or
Do not use over-the-counter Prevacid OTC (Prevacid OTC) without the advice of a doctor if you have:
trouble or pain with swallowing;
bloody or black stools; vomit that looks like blood or coffee grounds;
heartburn that has lasted for over 3 months;
frequent chest pain, heartburn with wheezing;
an electrolyte imbalance or metabolic disorder.
Some forms of lansoprazole may contain phenylalanine. Tell your doctor if you have phenylketonuria (PKU).
You may be more likely to have a broken bone in your hip, wrist, or spine while taking a proton pump inhibitor long-term or more than once per day. Talk with your doctor about ways to keep your bones healthy.
Do not give Prevacid OTC to a child younger than 1 year old. Prevacid OTC is not approved for use by anyone younger than 18 years old.
Ask a doctor before using this medicine if you are pregnant or breast-feeding.
How should I take Prevacid OTC?
Follow all directions on your prescription label and read all medication guides or instruction sheets. Use the medicine exactly as directed.
Prevacid OTC is usually taken before eating. Prevacid OTC should be taken in the morning before you eat breakfast.
Read and carefully follow any Instructions for Use provided with your medicine. Ask your doctor or pharmacist if you do not understand these instructions.
Shake the oral suspension (liquid) before you measure a dose. Use the dosing syringe provided, or use a medicine dose-measuring device (not a kitchen spoon).
Swallow the capsule whole and do not crush, chew, break, or open it.
Remove an orally disintegrating tablet from the package only when you are ready to take the medicine. Place the tablet in your mouth and allow it to dissolve, without chewing. Swallow several times as the tablet dissolves.
Use Prevacid OTC for the full prescribed length of time, even if your symptoms quickly improve.
Prevacid OTC should be taken only once daily for 14 days. It may take up to 4 days for full effect. Allow at least 4 months to pass before you start another 14-day treatment with Prevacid OTC.
Call your doctor if your symptoms do not improve or if they get worse while you are taking Prevacid OTC. If you take Prevacid OTC, call your doctor if your heartburn gets worse over the 14-day treatment, or if you need treatment more than once every 4 months.
Some conditions are treated with a combination of lansoprazole and antibiotics. Use all medications as directed.
Store at room temperature away from moisture, heat, and light. Do not freeze the liquid medicine.
What happens if I miss a dose?
Take the medicine as soon as you can, but skip the missed dose if it is almost time for your next dose. Do not take two doses at one time.
What happens if I overdose?
Seek emergency medical attention or call the Poison Help line at 1-800-222-1222.
What should I avoid while taking Prevacid OTC?
Prevacid OTC can cause diarrhea, which may be a sign of a new infection. If you have diarrhea that is watery or bloody, call your doctor before using anti-diarrhea medicine.
Prevacid OTC side effects
Get emergency medical help if you have signs of an allergic reaction: hives; difficulty breathing; swelling of your face, lips, tongue, or throat.
Call your doctor at once if you have:
severe stomach pain, diarrhea that is watery or bloody;
new or unusual pain in your wrist, back, hip, or thigh;
a seizure (convulsions);
kidney problems--little or no urination, blood in your urine, swelling, rapid weight gain;
low magnesium--dizziness, fast or irregular heart rate, tremors (shaking) or jerking muscle movements, feeling jittery, muscle cramps, muscle spasms in your hands and feet, cough or choking feeling; or
new or worsening symptoms of lupus--joint pain, and a skin rash on your cheeks or arms that worsens in sunlight.
Taking Prevacid OTC long-term may cause you to develop stomach growths called fundic gland polyps. Talk with your doctor about this risk.
If you use Prevacid OTC for longer than 3 years, you could develop a vitamin B-12 deficiency. Talk to your doctor about how to manage this condition if you develop it.
Common side effects may include:
This is not a complete list of side effects and others may occur. Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.
See also: Side effects (in more detail)
What other drugs will affect Prevacid OTC?
Tell your doctor if you use methotrexate.
Many drugs can affect Prevacid OTC, and some drugs should not be used at the same time. This includes prescription and over-the-counter medicines, vitamins, and herbal products. Not all possible interactions are listed here. Tell your doctor about all your current medicines and any medicine you start or stop using.
Remember, keep this and all other medicines out of the reach of children, never share your medicines with others, and use this medication only for the indication prescribed.
Always consult your healthcare provider to ensure the information displayed on this page applies to your personal circumstances.
Copyright 1996-2018 Cerner Multum, Inc. Version: 15.01.
More about Prevacid OTC (lansoprazole)
- Prevacid OTC Side Effects
- During Pregnancy or Breastfeeding
- Dosage Information
- Drug Interactions
- Pricing & Coupons
- En Español
- 1 Review
- Drug class: proton pump inhibitors