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Proton should not be taken: If the patient is allergic to omeprazole or any other ingredient of this medication; If the patient is allergic to medicines containing other proton pump inhibitors (e.g. pantoprazole, lansoprazole, rabeprazole, esomeprazole); If the patient is taking a medicine containing nelfinavir (used to treat HIV infection).
Proton should not be taken if any of the previously mentioned applies to the patient. Patients must be advised before taking Proton.
