Compare Omeprazole vs. Zantac

Head-to-head comparisons of medication uses, side effects, ratings, and more.

Prilosec
(omeprazole)

Zantac 75
(ranitidine)

Treats heartburn and stomach ulcers. Prilosec (Omeprazole) gives you long-lasting heartburn relief. Choose the cheapest proton pump inhibitor because they all work equally well for heartburn.Relieves heartburn and stomach ulcers. Zantac 75 (ranitidine) is an effective and inexpensive medicine for hearburn with few side effects, but may interfere with other drugs.
Reviews & ratings
Filter group. All currently selected
Filter group. All currently selected
5.53Omeprazole
Reviews for Omeprazole
80%
of people (All ages) say Omeprazole is worth it
59%
say it works well
8%
say it's a big hassle
1167 reviews
Have you used Prilosec (omeprazole)?
Worth itNot sureNot worth it
Reviews for Zantac
72%
+8% better vs. Omeprazole
44%
+15% better vs. Omeprazole
7%
-1% worse vs. Omeprazole
1062 reviews
Have you used Zantac 75 (ranitidine)?
Worth itNot sureNot worth it
Side effects
OmeprazoleZantac
  • Upper respiratory infection 75%
  • Fever 33%
  • Headache 7%
  • Abdominal pain 5%
  • Nausea 4%
  • Diarrhea 4%
  • Accidental injuries 4%
  • Flatulence 3%
  • Vomiting 3%
More Omeprazole side effects »

The Zantac FDA package insert doesn’t have numbers about how common side effects are.

More about Zantac side effects »
How it works
OmeprazoleZantac
Prilosec (Omeprazole) is a proton pump inhibitor (PPI). It lowers the amount of acid in your stomach, treats heartburn, and heals ulcers.Zantac 75 (ranitidine) reduces the production of acid by blocking a chemical from acting on the acid-producing cells in your stomach.
Type of medication
OmeprazoleZantac
Prescription or OTCPrescription or OTC
Available as
OmeprazoleZantac
  • Extended release
  • Pill
  • Oral solution
  • Oral syrup
  • Injection
Used for
OmeprazoleZantac
Risk factors for serious side effects
OmeprazoleZantac
  • Helicobacter pylori infection
  • Autoimmune disease
  • Being hospitalized
  • Antibiotic use
  • Osteoporosis
Detailed Prilosec (omeprazole) risks & warnings »
  • Aged 60 years or older
  • Kidney conditions
  • Liver conditions
  • Acute Porphyria
  • Asthma
Detailed Zantac 75 (ranitidine) risks & warnings »
Pregnancy

Research studies with animals found harmful effects on unborn babies. It hasn’t been properly studied in humans. The benefits might outweigh the risks even if you’re pregnant. Talk with your doctor.

Interactions
OmeprazoleZantac
  • Avoid drug interactions by telling your doctor all of the other medications or herbal supplements you take before starting Omeprazole.
  • Can interact with other drugs so be sure your doctor knows all the medicine you're taking before starting Omeprazole.
  • Zantac 75 (ranitidine) can interact with certain prescription and over-the-counter medications. Let your doctor or pharmacist know about the medicines you are currently taking.
Alcohol
OmeprazoleZantac
No alcohol related info.
  • The syrup product may contain up to 7.5% of alcohol.
Food
OmeprazoleZantac
  • Take 1 hour before a meal.
No food related info.
Upsides and benefits
OmeprazoleZantac
  • Most people can take Omeprazole without any noticeable day-to-day side effects.
  • Omeprazole lasts longer than other types of antacids (like Zantac, Pepcid, or Tums), and you only need to take it once or twice a day.
  • You can take it in combination with a quick-acting antacid (like Maalox or Tums) if you need relief right away.
  • In studies it was better than a placebo (sugar pill) and as good as other proton pump inhibitors at treating heartburn.
  • Available as both a generic and over-the-counter option, so it's pretty affordable.
  • Zantac 75 (ranitidine) works well to relieve heartburn symtoms and is quite tolerable.
  • You can take it in combination with a quick-acting antacid (like Maalox or Tums) if you need relief right away.
  • If you have trouble swallowing pills you may find the liquid product a good option.
  • Inexpensive with over-the-counter and generic options.
  • Coupons are available for the brand product - speak to your doctor or pharmacist.
Downsides and risks
OmeprazoleZantac
  • Doesn't start working as fast as some other antacids like Tums, Rolaids, or Maalox.
  • Like with other proton pump inhibitors, long-term use can cause weak or broken bones.
  • Can cause low levels of magnesium in the blood. You might need to take a magnesium supplement if you use Omeprazole long-term.
  • Although the generic is affordable, other medications might still be cheaper than Omeprazole.
  • Can interact with other drugs so be sure your doctor knows all the medicine you're taking before starting Omeprazole.
  • Zantac 75 (ranitidine) doesn't work as quickly as some other acid reducers. Speak to your doctor or pharmacist if you need quicker relief.
  • Zantac 75 (ranitidine) does not last as long as some other acid reducers. Speak to your doctor or pharmacist if you need longer relief.
  • May not be as effective in healing the esophagus when it is inflammed or torn, known as erosive esophagitis. Your doctor will assess which medication is best for you.
  • Can lower your vitamin B12 levels if you use Zantac 75 (ranitidine) for a long time. Your doctor can order lab tests to monitor your vitamin B12 levels.
Tips from our pharmacists for people taking the medication
OmeprazoleZantac
  • Take 1 hour before a meal.
  • Don't chew or crush capsules; swallow them whole.
  • If you have trouble swallowing you can carefully open the capsules and sprinkle the inside pellets onto applesauce. Swallow the applesauce without chewing or crushing the pellets.
  • When using Omeprazole long-term, take a calcium citrate with vitamin D supplement daily to prevent bone loss. Be sure it's calcium citrate because it works the best when using a proton pump inhibitor.
  • Get a blood test for your magnesium level once a year; you may need a magnesium supplement while using Omeprazole.
  • Avoid drug interactions by telling your doctor all of the other medications or herbal supplements you take before starting Omeprazole.
  • To prevent a heartburn attack, take Zantac 75 (ranitidine) 30 minutes before eating.
  • Works within 30 to 60 minutes. Relief lasts up to 12 hours.
  • Do not use Zantac 75 (ranitidine) for more than 14 days. Talk to your doctor if your symptoms do not improve after 2 weeks of using the over-the-counter product, as this may indicate a more serious problem.
  • The syrup product may contain up to 7.5% of alcohol.
  • Speak to your doctor or pharmacist about lifestyle and dietary changes that can help prevent heartburn.
Learn more
More about OmeprazoleSide effectsReviews & ratingsAlternativesFDA package insert
Have you used Prilosec (omeprazole)?
Worth itNot sureNot worth it
More about ZantacSide effectsReviews & ratingsAlternativesFDA package insert
Have you used Zantac 75 (ranitidine)?
Worth itNot sureNot worth it