OK, so at what age is someone considered elderly? In the newspaper, many people of various ages are described that way. This question came from a different reader on the same wavelength.
Common side effects of Prilosec and Zantac that are similar include diarrhea, headache, nausea, and vomiting. Side effects of Prilosec that are different from Zantac include rash and dizziness. Side effects of Zantac that are different from Prilosec include constipation, fatigue, and insomnia.
Rare Omeprazole Side Effects. Rare side effects of omeprazole occur in less than 1 percent of people taking the drug. Because these side effects are so uncommon, it can be difficult to tell whether they are actually caused by omeprazole or by factors unrelated to the medication.