It's a common and frustrating experience: a medication that worked well initially seems to lose effectiveness over months or years. There are a few different explanations, and they call for different responses.
True tolerance vs. other explanations
True pharmacological tolerance to PPIs is actually less common than people assume — more often, what looks like the medication "stopping working" is actually a change in the underlying condition (worsening hiatal hernia, weight gain, new dietary habits) outpacing what the same dose can control, rather than the drug itself becoming less effective at the cellular level.
Timing and consistency issues
PPIs work best taken consistently, thirty to sixty minutes before a meal, and inconsistent timing or occasional missed doses can make them seem less effective even without any change in the underlying reflux. This is one of the most common and easily fixed reasons for apparent reduced effectiveness.
What to do if this happens to you
Rather than simply increasing the dose on your own or switching medications, it's worth reviewing timing and adherence first, then discussing with a doctor whether the underlying reflux has changed (weight, diet, new hiatal hernia) or whether a different medication or combination approach makes more sense.
