9 Medications That Make Acid Reflux Worse

If your reflux flares up no matter how carefully you eat, the problem might not be on your plate at all – it could be in your medicine cabinet. Several extremely common medications quietly make acid reflux and LPR worse, either by loosening the valve that’s meant to keep acid down, by slowing your stomach so it empties later, or by irritating the lining of the oesophagus directly.

The medications most often involved are calcium channel blockers, nitrates, some asthma inhalers and theophylline, anticholinergics, sedatives such as benzodiazepines, opioid painkillers, GLP-1 drugs like Ozempic, and a group of “pill irritant” drugs including NSAIDs, aspirin, doxycycline, bisphosphonates, iron and potassium supplements.

I want to be clear from the start: this article is about understanding why a drug might be aggravating your symptoms – not a signal to stop anything. Never stop a prescribed medication on your own. The goal here is to give you the mechanisms so you can have a much smarter conversation with your doctor or pharmacist.

Key Takeaways

• Medications worsen reflux in three main ways: relaxing the lower oesophageal sphincter (LOS), slowing stomach emptying, or directly irritating the oesophageal lining.
• Calcium channel blockers, nitrates, anticholinergics, theophylline, beta-agonist inhalers and benzodiazepines can all lower the pressure of the valve that keeps acid in the stomach.
• Opioids and GLP-1 drugs (such as Ozempic) delay gastric emptying, leaving food and acid sitting longer with more chance to reflux.
• NSAIDs, aspirin, doxycycline, bisphosphonates, iron, potassium and vitamin C can cause “pill oesophagitis” – a chemical burn if the tablet lingers in the oesophagus.
• How you take a pill matters: too little water and lying down afterwards dramatically raise the risk of irritation.
• Stopping acid-suppressing drugs abruptly can also worsen symptoms temporarily through acid rebound.
• Never stop a prescribed medication without medical advice – ask about timing, formulation or alternatives instead.

How Medications Make Reflux Worse: The Three Mechanisms

Before I name names, it helps to understand the plumbing. Reflux isn’t really about “too much acid” – it’s about acid and pepsin ending up where they shouldn’t be. Medications tip that balance in three distinct ways, and knowing which mechanism is at play tells you what to do about it.

The first is by weakening the lower oesophageal sphincter, the ring of muscle that acts as a one-way gate between your oesophagus and stomach. If you want the full picture on this, I’ve written a detailed guide on how the lower oesophageal sphincter works in LPR. The second is by slowing stomach emptying, so a meal sits fermenting and pressurising for longer. The third is direct irritation of the oesophageal lining, which is a different problem entirely – a chemical injury rather than a reflux event, though it feels similar and often overlaps.

Medications That Relax the Lower Oesophageal Sphincter

This is the big category, and it catches a lot of people out because these are everyday prescriptions. Anything that relaxes smooth muscle around the body tends to relax the sphincter too. Many commonly used drugs – including nitrates, anticholinergics, beta-adrenergic agonists, theophylline-type drugs and benzodiazepines – are known to promote reflux specifically by reducing sphincter pressure [Tutuian, Best Practice & Research Clinical Gastroenterology, 2010].

Calcium Channel Blockers

Drugs like amlodipine, nifedipine and diltiazem are prescribed for blood pressure and heart conditions. They work by relaxing blood vessel walls – but that same relaxing effect reaches the oesophageal sphincter. Medications that relax the LOS, calcium channel blockers among them, have been directly linked to reflux and its long-term complications [Corley et al., American Journal of Gastroenterology, 2006]. If you developed reflux around the same time you started a blood pressure drug, it’s worth mentioning to your GP.

Nitrates

Nitrates (glyceryl trinitrate, isosorbide) are used for angina and work by relaxing smooth muscle to widen blood vessels. Predictably, they also relax the sphincter and can facilitate reflux.

Anticholinergics

This is a broad group – some older antihistamines, bladder medications (oxybutynin), certain antidepressants (tricyclics such as amitriptyline) and some Parkinson’s drugs. They relax the sphincter, but they also do something sneaky: they dry up saliva. Saliva is naturally alkaline and helps clear acid and pepsin from the throat, so less of it means slower clearance and more lingering irritation – a double hit for LPR in particular.

Asthma Medications

Theophylline and beta-agonist inhalers (such as salbutamol) relax airway muscle to help you breathe – and relax the oesophageal sphincter in the process. There’s a frustrating loop here, because reflux itself can trigger respiratory symptoms, sometimes to the point of being mistaken for asthma. If you’re on asthma treatment and still coughing, reflux may be part of the story.

Benzodiazepines and Sedatives

Diazepam and similar sedatives relax muscle throughout the body, sphincter included, and are recognised contributors to reflux [Tutuian, Best Practice & Research Clinical Gastroenterology, 2010]. This matters for anyone using them for sleep, because taking a sedative and then lying down is close to a worst-case scenario for night-time reflux. Since anxiety and reflux are so closely tied, it’s worth reading whether LPR can be caused by anxiety before assuming a sedative is the right fix.

A quick note on erectile dysfunction drugs: sildenafil and similar PDE-5 inhibitors also relax smooth muscle and can lower sphincter pressure, so they belong in this category too, even though they’re less commonly discussed.

Medications That Slow Stomach Emptying

The second mechanism is all about timing. If your stomach empties slowly, a meal sits there longer, pressure builds, and there’s simply more opportunity for contents to travel the wrong way.

Opioid Painkillers

Codeine, tramadol, morphine and related drugs are notorious for slowing the gut. In the oesophagus specifically, opioids impair normal peristalsis and slow gastric emptying, and this combination increases the likelihood of gastric contents refluxing upward [Lacy, Gastroenterology & Hepatology, 2016]. If you’ve started a course of strong painkillers and your reflux has flared, this is very likely why.

GLP-1 Drugs (Ozempic, Wegovy, Mounjaro)

These weight-loss and diabetes drugs work partly by slowing gastric emptying, which is exactly why they can trigger or worsen reflux, heartburn and nausea in some people. This has become such a common question that I’ve written a full breakdown of whether Ozempic causes heartburn, reflux and LPR, including how to manage it if you want to stay on the medication.

Medications That Irritate or Burn the Oesophagus (Pill Oesophagitis)

This category is different. These drugs don’t necessarily cause reflux – they cause a chemical injury when a tablet or capsule gets stuck and dissolves against the oesophageal wall. The result, called pill oesophagitis, produces burning, painful swallowing and chest discomfort that mimics reflux, and it can genuinely make existing reflux damage worse. The most commonly implicated drugs are doxycycline and other antibiotics, NSAIDs and aspirin, bisphosphonates, potassium chloride, iron (ferrous sulfate) and vitamin C [Saleem & Sharma, StatPearls, 2023].

NSAIDs and Aspirin

Ibuprofen, naproxen, aspirin and similar anti-inflammatories are a double problem: they can irritate the oesophageal lining directly, and they weaken the protective prostaglandin barrier that normally shields the mucosa. If you’re reaching for these regularly and dealing with reflux, that’s worth flagging.

Antibiotics (Doxycycline and Tetracyclines)

These are among the single most common causes of pill oesophagitis, largely because the capsules are dissolvable in a way that creates a very low-pH, acidic micro-environment right against the oesophageal wall if they don’t go all the way down.

Bisphosphonates

Osteoporosis drugs such as alendronate are well known for this – so much so that the link between alendronate and oesophagitis was documented decades ago [de Groen et al., New England Journal of Medicine, 1996]. This is exactly why these tablets come with strict instructions to take them with a full glass of water and remain upright for 30 minutes.

Iron, Potassium and Vitamin C

Iron and potassium supplements, along with vitamin C (ascorbic acid), are acidic or hyperosmolar and can burn the lining if they linger [Saleem & Sharma, StatPearls, 2023].

How to Take Pills Without Burning Your Oesophagus

The good news is that pill oesophagitis is largely preventable with technique. The evidence points to a few simple habits: take tablets with a generous glass of water (at least 200–250 ml), stay upright for around 30 minutes afterwards, and don’t take pills right before lying down or going to bed [Saleem & Sharma, StatPearls, 2023]. If a particular tablet is a repeat offender, ask your pharmacist whether a liquid formulation exists.

The Reflux Medication Paradox: When Stopping Makes It Worse

Here’s a twist that surprises people. The drugs meant to treat reflux – proton pump inhibitors like omeprazole and lansoprazole – can worsen symptoms if you come off them too quickly. Your stomach adapts to acid suppression, and when the drug stops, it can temporarily overproduce acid, a phenomenon called acid rebound. I’ve covered how to navigate this properly in my guide on getting off PPIs and managing acid rebound. It’s a reminder that even the “right” drugs need a sensible strategy.

What to Do If You Suspect a Medication Is Worsening Your Reflux

First and most importantly: don’t stop anything on your own. Many of these medications treat serious conditions, and the reflux is usually the lesser problem. Instead, take a practical approach.

• Note the timing – did your symptoms start or worsen after a new prescription?
• Write down everything you take, including over-the-counter painkillers and supplements, and bring the list to your GP or pharmacist.
• Ask specifically about alternatives, a different dose, a different time of day, or a different formulation.
• In the meantime, protect the lining with sensible habits – a raft-forming barrier like Gaviscon Advance after meals can help shield the oesophagus and throat.
• If your reflux medication itself doesn’t seem to be working, that’s a separate issue worth reading about in why acid reflux medication sometimes fails.

Frequently Asked Questions

Can blood pressure medication cause acid reflux?

Yes. Calcium channel blockers (such as amlodipine and nifedipine) and nitrates relax smooth muscle, including the lower oesophageal sphincter, which can allow acid to reflux more easily. If your reflux began around the time you started a blood pressure drug, discuss it with your doctor – there are often alternatives.

Do painkillers make acid reflux worse?

They can, in two different ways. NSAIDs and aspirin can irritate the oesophageal lining and weaken its protective barrier, while opioid painkillers slow stomach emptying and impair oesophageal movement, both of which promote reflux. Paracetamol is generally gentler on the oesophagus than NSAIDs.

Does Ozempic cause acid reflux?

GLP-1 drugs like Ozempic slow gastric emptying as part of how they work, and this can trigger or worsen reflux, heartburn and nausea in some people. It doesn’t affect everyone, and there are ways to manage it – I cover them in detail in my dedicated article on Ozempic and reflux.

Can antibiotics cause heartburn or reflux symptoms?

Yes. Doxycycline and other tetracycline antibiotics are among the most common causes of pill oesophagitis, a chemical burn that feels like severe heartburn. Taking them with plenty of water and staying upright afterwards greatly reduces the risk.

Should I stop my medication if it’s causing reflux?

No – never stop a prescribed medication without medical advice. Many of these drugs treat conditions far more serious than reflux. The right move is to speak to your GP or pharmacist about timing, dose, formulation or alternatives.

Why does my reflux get worse when I stop my PPI?

This is acid rebound. After a period of acid suppression, the stomach can temporarily overproduce acid when the drug stops, causing a flare. It usually settles, and a gradual, planned approach to coming off the medication makes it far more manageable.

Can supplements make acid reflux worse?

Some can. Iron, potassium and vitamin C tablets are acidic or hyperosmolar and can irritate the oesophagus if they linger. Fish oil and certain others can also relax the sphincter or cause reflux-like burping. Take supplements with water, upright, and ideally not at bedtime.

Conclusion

If you’ve been doing everything right with your diet and lifestyle and your reflux still won’t settle, your medicine cabinet is one of the first places I’d look. The pattern I see again and again is someone blaming themselves for a flare that was actually being driven by a blood pressure tablet, a painkiller, an inhaler or a supplement taken the wrong way. Once you understand the three mechanisms – a relaxed sphincter, slower stomach emptying, or direct irritation of the lining – the picture usually becomes much clearer, and the conversation with your doctor becomes far more productive.

None of this means throwing your medications away. It means being strategic: adjusting timing, asking about alternatives, taking pills with enough water while upright, and protecting the oesophagus and throat while you sort things out. Diet still does the heavy lifting, though. Calming the reflux itself – and clearing the pepsin that keeps the throat and oesophagus sensitised – gives your body the stable baseline it needs so that a single awkward medication doesn’t tip you back into a flare.

That’s exactly what my Wipeout Diet Plan is built to do: it’s the complete, step-by-step system for lowering reflux and LPR at the source, and it’s the most thorough resource I’ve put together for getting symptoms under control. If you want a simpler starting point, the Wipeout Food Reference Guide is an essential companion – it lays out exactly which foods and drinks are safe for acid reflux and LPR along with their pH values, so you always know what’s reflux-friendly at a glance. Between the two, you’ll have both the deep strategy and the quick day-to-day reference you need.

Research Sources

• [Tutuian, Best Practice & Research Clinical Gastroenterology, 2010] – A review confirming that nitrates, anticholinergics, beta-agonists, theophylline-type drugs and benzodiazepines promote reflux by lowering lower oesophageal sphincter pressure, alongside drugs that cause direct mucosal injury.
• [Corley et al., American Journal of Gastroenterology, 2006] – Links use of LOS-relaxing medications, including calcium channel blockers, to reflux and its long-term consequences.
• [Saleem & Sharma, StatPearls, 2023] – Details the drugs most likely to cause pill oesophagitis (antibiotics, NSAIDs, bisphosphonates, potassium, iron, vitamin C) and the practical steps that prevent it.
• [de Groen et al., New England Journal of Medicine, 1996] – The landmark report establishing bisphosphonate-related oesophageal injury and the need to take these tablets with water while staying upright.
• [Lacy, Gastroenterology & Hepatology, 2016] – Explains how opioids impair oesophageal peristalsis and slow gastric emptying, increasing the likelihood of reflux.