Thanks for posting your query.
I am Dr.Ratnakar Kini and I am pleased to assist you.Omeprazole
is a very safe medication. Headache and stomach are the most common side effects.
Low platelet count
count and abnormality in liver
function though reported with this medication are very rare side effects.
Other causes of these issues should be looked in to before attributing them omeprazole.
I hope that answers your question.