Antacids (Pepsid & PPIs): Reflux, Side Effects, and Nutrient Deficiencies

I’m a member of several Facebook groups that discuss reflux. I used to spend hours and hours reading those posts. But I stopped looking at those over a year ago because they really weren’t helping me (and my therapist strongly discouraged me from reading them). Lately, I’ve been reading them again, but not to find solutions. I feel like I’ve already found those. I’ve been reading them while doing some research. So I stumbled upon this question today:

“Does anyone worry about esphogaus cancer?”

I didn’t even read the comments because: anxiety causes reflux (I wondered and doubted this for a long time, but I have become very aware that increased anxiety increases reflux – and that’s what my 30 year experienced therapist says, too.)

Also, according to Claude.ai (with whom I have endlessly discussed all issues involving reflux), all antacids including famatadine (pepsid) and proton pump inhibitors (PPIs)(Prilosec, etc) screw with your neurotransmitters, and absolutely CAUSE anxiety.

Here’s what Claude says about why Pepsid might cause anxiety in some people (I think likely all people, if you stay on it long enough; I had ZERO history of anxiety before starting Pepsid. Now I have pretty bad anxiety with physical symptoms):

Here are a few reasons why Pepcid (famotidine) could potentially cause anxiety:

• Pepcid blocks histamine receptors in the body. Histamine has important roles not just in acid production in the stomach, but also in brain function as a neurotransmitter. Blocking histamine action could affect mood and emotions.
• By reducing stomach acid production, Pepcid may interfere with proper absorption of some nutrients like vitamin B12, iron, and magnesium. Deficiencies in these nutrients have been linked with increased anxiety in some people.*
• Pepcid is metabolized by liver enzymes called CYP450s. This same family of enzymes breaks down neurotransmitters and other brain chemicals. Taking Pepcid may alter metabolism of substances that influence mood and emotions.
• There are histamine receptors throughout the central nervous system, including parts of the brain involved in emotional processing like the amygdala. Blocking central histamine receptors could theoretically impact anxiety pathways.
• Some people may experience anxiety or paranoia as side effects of medications, even without a clear physiological cause. If anxiety develops after starting Pepcid, it could simply be an individual reaction not clearly explainable by mechanism.”

*I also developed severely low ferritin and a B12 deficiency (note: most doctors do not properly test for B12 — you need to read books on B12 written by docs who specialize in B12 to understand this). I started B12 injections, have had iron infusions recommended — and again had ZERO problems with these nutrients before starting pepsid and this God awful reflux friendly diet. And who is surprised that both B12 and iron deficiencies can cause both reflux and anxiety. And pepsid and PPIs make it particularly difficult to absorb iron, B12, protein, and calcium (because those require more steps in digestion, compared with other nutrients).

(Incidentally, Chat GPT says that Pepsid can cause anxiety, but that it’s not common. Yeah, right, not common. Please check the link to the drug website below, and I think you will quickly realize that AI isn’t always correct, at least as far as saying these effects are not common!)

Here is what Claude says about whether Pepsid can directly cause reflux:

“Yes, Pepcid (famotidine) can sometimes paradoxically cause reflux symptoms in certain people. There are a few reasons this can happen:

1. Rebound acid hypersecretion – Pepcid suppresses acid production in the stomach by blocking histamine-2 receptors. This initially decreases acid levels. However, over time the stomach may overcompensate once the medication wears off by secreting more acid, causing a “rebound effect”.
2. Tolerance development – Similarly, some research shows the stomach can develop tolerance to the acid reducing effects of Pepcid over time with regular use. This leads to increased acid secretion and rebounds.
3. Non-acid reflux – Pepcid mainly treats acid reflux symptoms. However, people can still experience reflux of non-acidic stomach contents, such as bile, enzymes, or foam. These may continue causing irritation or symptoms even if acid levels are lowered by Pepcid.
4. Gastrin increase – Pepcid blocks negative feedback signals for acid production. This can lead to rising gastrin levels, which stimulate acid secretion. Prolonged hypergastrinemia from famotidine use can promote reflux.

So in summary, while Pepcid is designed to treat reflux, its mechanisms of action combined with compensatory physiological responses can sometimes interfere with acid control and worsen reflux in some patients taking it long-term. This may necessitate dosage adjustments, combination therapy, or alternative treatment options.”

And a low acid diet has almost no vitamin C, before you take antacids that further reduce their absorption. Here is what Claude.ai says about whether Vitamin C deficiency can cause anxiety or insomnia:

“Yes, vitamin C deficiency can potentially contribute to anxiety and insomnia. Here are a few ways that low vitamin C levels may be linked to these conditions:

1. Vitamin C regulates neurotransmitters – Vitamin C participates in the synthesis of important neurotransmitters like norepinephrine and serotonin. These brain chemicals modulate mood, anxiety levels, and sleep-wake cycles. Low vitamin C can disrupt optimal neurotransmitter functioning.
2. Antioxidant effects – Vitamin C is a vital antioxidant that protects against oxidative stress from free radicals and inflammation. Chronically high stress and inflammation appear connected to anxiety and insomnia. Vitamin C deficiency may allow inflammation-related damage to worsen these conditions.
3. Enzyme cofactor – Vitamin C serves as a cofactor for enzymatic reactions that produce hormones related to stress adaptation like cortisol. Suboptimal vitamin C can lead to impaired synthesis of these hormones, causing dysregulation of biological stress reactions that may manifest in anxiety/insomnia.
4. Collagen production – Vitamin C aids collagen production, which is essential for healthy blood vessels and tissue repair. Poor collagen function due to low vitamin C has been associated with mood disorders and weakened sleep-wake cycles.

So while vitamin C deficiency on its own does not directly trigger anxiety or sleep disorders in most cases, inadequate intake can contribute by impacting neurotransmitters, hormones, enzymatic reactions, and tissue integrity that help regulate and buffer mental health.

So while a biochemical link between famotidine and anxiety is theoretically possible, the connection is typically not common or clearly proven. But anxiety reactions seem to happen with this drug sometimes, so monitoring symptoms when starting Pepcid is a good idea. Letting your doctor know is also important if significant anxiety develops.”

And here’s what Claude says about whether Vitamin C causes constipation (which, according to a best-selling author / board certified gastro doc “Dr. B,” whose 6 week intensive course I took two summers ago, constipation causes reflux, and treating constipation often resolves reflux):

“Yes, there is some evidence that vitamin C deficiency can contribute to constipation. Here are a few ways that low vitamin C levels may cause or worsen constipation:

1. Impaired collagen production – Vitamin C is essential for making collagen which provides structure and strength to intestinal walls and tissue. Weakened collagen due to vitamin C deficiency can slow motility and contraction of intestinal muscles needed for bowel movements.
2. Increased inflammation – Vitamin C helps control inflammation. Higher levels of inflammation due to low vitamin C can damage intestinal lining, cause abdominal pain or bloating, and slow down transit of stool through the colon.
3. Altered neurotransmitter production – Vitamin C assists with production of neurotransmitters like serotonin that stimulate contractions in the digestive tract. Lower vitamin C can reduce these neurotransmitters and weaken colonic contractions.
4. Poor vasculature – Vitamin C aids in strengthening blood vessels supplying the GI tract. Suboptimal blood flow over time from vitamin C deficiency can impact nutrition and oxygenation needed for healthy motility patterns.
5. Increased oxidative stress – As an antioxidant, vitamin C protects against damaging oxidative stress. Higher oxidative stress levels from low vitamin C can impair cells in the colon and digestive muscles leading to dysfunctional motility and constipation.

So while mild deficiency may not directly trigger constipation in some individuals, chronically low vitamin C intake can contribute to multiple mechanisms that increase risk for constipation and make it harder to resolve when occurring. Restoring adequate vitamin C levels often helps improve bowel function.”

There are also numerous studies showing that treating constipation resolves reflux. Additionally, you absolutely might not know that you have constipation. I had daily normal bowel movements (but with more straining that I had ever had before). Then I discovered only through two different CT scans, over a year apart, that I had moderate constipation. (The doc has to request that any reading radiologist specifically “rule out constipation,” otherwise they likely will not report it.) I did not have any digestive problems whatsoever before starting Pepsid & Reflux Gourmet.

Here’s what Claude says about whether Vit C deficiency causes reflux:

“Yes, Pepcid (famotidine) can sometimes paradoxically cause reflux symptoms in certain people. There are a few reasons this can happen:

1. Rebound acid hypersecretion – Pepcid suppresses acid production in the stomach by blocking histamine-2 receptors. This initially decreases acid levels. However, over time the stomach may overcompensate once the medication wears off by secreting more acid, causing a “rebound effect”.
2. Tolerance development – Similarly, some research shows the stomach can develop tolerance to the acid reducing effects of Pepcid over time with regular use. This leads to increased acid secretion and rebounds.
3. Non-acid reflux – Pepcid mainly treats acid reflux symptoms. However, people can still experience reflux of non-acidic stomach contents, such as bile, enzymes, or foam. These may continue causing irritation or symptoms even if acid levels are lowered by Pepcid.
4. Gastrin increase – Pepcid blocks negative feedback signals for acid production. This can lead to rising gastrin levels, which stimulate acid secretion. Prolonged hypergastrinemia from famotidine use can promote reflux.

So in summary, while Pepcid is designed to treat reflux, its mechanisms of action combined with compensatory physiological responses can sometimes interfere with acid control and worsen reflux in some patients taking it long-term. This may necessitate dosage adjustments, combination therapy, or alternative treatment options.”

Here’s what Claude says about whether a Vitamin B12 deficiency can cause constipation, reflux or anxiety:

“Yes, vitamin B12 deficiency can contribute to constipation, acid reflux, and anxiety in some people. Here are the main ways that low B12 levels may lead to these issues:

Constipation:

• Impaired neurotransmitter production – B12 supports making neurotransmitters like serotonin that control gut motility. Low levels impact peristalsis needed for regular bowel movements.
• Intestinal inflammation – B12 deficiency leads to elevated homocysteine levels that irritate intestinal lining and impair mobility.
• Weak intestinal wall – Lack of B12 can reduce intestinal tone and contractility necessary for defecation.

Acid reflux:

• Increased inflammation – B12 regulates inflammatory pathways. Heightened inflammation from low B12 can damage protective esophageal tissues.
• Impaired NO production – Vitamin B12 assists in nitric oxide synthesis which promotes esophageal sphincter relaxation. Decreased NO from B12 deficiency causes sphincter dysfunction.

Anxiety:

• Altered mood regulation – B12 aids in making serotonin, dopamine, and GABA neurotransmitters that regulate emotional responses. Disrupted signaling from deficiency may increase anxiety.
• Elevated homocysteine – High homocysteine levels due to low B12 are associated with depression and other mood disorders like anxiety.

So in summary, vitamin B12 deficiency allows broad systemic effects including altered immunity, impaired nerve conduction, and disrupted neurotransmitter production – which can manifest symptoms like constipation, reflux, and anxiety disorders in some cases. Restoring adequate B12 intake can often help reverse associated neurological and psychiatric effects.”

Here’s what Claude says about whether low ferritin can cause IBS, constipation, reflux, or anxiety:

“Yes, having low ferritin levels, indicating iron deficiency, can contribute to increased risks of irritable bowel syndrome (IBS), constipation, acid reflux, and exacerbation of IBS symptoms in some people. Here are some of the mechanisms linking low ferritin to these digestive conditions:

IBS:

• Iron helps regulate bowel motility – iron deficiency disrupts smooth muscle contractions leading to spasms or slowed motility patterns typical of IBS.
• Inflammation – Low iron raises inflammatory cytokines which can irritate the intestinal lining and worsen IBS inflammation.

Constipation:

• Impaired muscle function – Iron is needed for proper muscle and nerve activity in the intestines. Low iron causes weakened intestinal contractions resulting in constipation.
• Low neurotransmitters – Iron assists in neurotransmitter production like serotonin which stimulates digestive tract mobility. Low levels from iron deficiency reduce these.

Acid reflux:

• Weakened sphincter – Iron supports muscle tone and performance. Deficiency can relax the esophageal sphincter allowing increased reflux episodes.
• Impaired healing – Iron promotes tissue healing and recovery. Deficiency causes persistence of acid-induced esophageal damage.

So in summary, iron deficiency and low ferritin levels can negatively impact gastrointestinal functioning through decreased muscle contraction, worsened inflammation, and reduced tissue healing capacity – leading to higher risks for developing IBS, constipation, reflux complications, and aggravated symptoms if these conditions already exist.”

Here’s what Claude says about whether low protein can cause IBS, reflux, constipation, or anxiety (and remember, antacids greatly impair the absorption of iron, B12, calcium, and protein, among other nutrients — but those are the worst because they are harder to digest):

“Yes, it is possible that chronically low protein intake could contribute to increased risks or worsening of irritable bowel syndrome (IBS), constipation, acid reflux, and anxiety. Here are some ways protein deficiency may be linked to these conditions:

IBS – Protein supports a healthy intestinal barrier and gut microbiome diversity. Low protein diets allow overgrowth of harmful bacteria strains and increased intestinal permeability, which studies show correlate to IBS symptoms.

Constipation – Adequate protein promotes regular bowel movements via microbial metabolites, optimal stool bulk, and intestinal contractions. Low protein leads to harder, drier stools that worsen constipation.

Acid reflux – Protein deficiency can deplete amino acids like glutamine needed for tight cell junctions in the esophageal lining. Weakened defenses promote erosion, inflammation, and damage from stomach acid exposure.

Anxiety – Lack of sufficient amino acids from low protein intake can impact production of key neurotransmitters that regulate mood and stress responses. This has been shown to dysregulate biological pathways connected to anxiety disorders.

Additionally, protein malnutrition over time can also cause slowed motility, vitamin/mineral deficiencies, blood sugar fluctuations, dehydration, and suppressed immunity – all of which provide mechanisms that may heighten risk for the gastrointestinal and psychological conditions listed.

Therefore, while low protein alone may not necessarily trigger these issues in all individuals directly, long-term inadequate protein intake can allow physiological changes associated with increased prevalence of IBS, constipation gastroesophageal reflux issues, and anxiety in genetically or environmentally susceptible people.”

Here’s what Claude says in answer to this question “is calcium needed to heal the esophagus in someone who has reflux?”:

“Yes, calcium is important for proper healing of the esophagus in those suffering from acid reflux. Here are some key reasons why:

1. Strengthens mucosal barrier – Calcium helps maintain the mucosal barrier of the esophageal lining, which protects the tissue from erosion when exposed to stomach acid. This barrier is often compromised in those with reflux. Calcium supports tighter cell junctions.
2. Stimulates growth factors – Calcium triggers the release of epidermal growth factor and other compounds that stimulate cellular regeneration and accelerate healing of reflux-induced damage like ulcers or Barrett’s esophagus.
3. Reduces inflammation – Calcium can dampen inflammatory pathways activated by stomach acid irritation. Lowering inflammation aids healing by reducing swelling, cellular oxidative damage, and cytokines that slow tissue repair.
4. Improves tissue resistance – Adequate dietary calcium intake provides the calcium needed to support connective tissues and intercellular cement substances protecting the esophagus. This strengthens resistance to acid.

So in summary, getting sufficient calcium is extremely helpful for anyone suffering from chronic acid reflux or esophageal damage like erosions, ulcers, or Barrett’s changes to promote healing and repair by protecting and regenerating the esophageal mucosa. Calcium supplements may be warranted if dietary intake is insufficient.”

If you’ve read this far, you’ve read a lot. Let me just say that this is only scratching the surface of the several thousand hours I’ve spent studying reflux, and trying to find a solution. I am angry as hell that I was ever prescribed Pepsid, because my symptoms at the time were NOT debilitating — and likely could have been cured with diet alone. But here we are. I’m trying everything humanly possible to get OFF that toxic stuff. Of course, as a bonus, Pepsid causes acid rebound, thus making it very difficult to stop, and potentially causing irreparable damage to the esophagus in the process.

I also know Pepsid causes bad anxiety from my own extensive personal experience. I believe anxiety from having reflux, combined with the ongoing assault of Pepsid on my body, is the reason that I cannot fully heal and therefore stop taking Pepsid (not to mention the undeniable rebound anxiety that Pepsid unquestionably causes).

As a matter of fact, late one night when I couldn’t sleep due to this anxiety, I spent hours reading a drug website absolutely FILLED with people mortified with the side effects that Pepsid was causing them. A LOT of people report extreme, debilitating, totally abnormal anxiety (and a lot of other extremely concerning side effects) after even briefly periods taking Pepsid.

And PPIs are worse. They shut down more acid, and proton pumps are in Every. Cell. Of. Your. Body. It is NOT GOOD to shut them down 100%! There are many published studies of extensive damage caused by PPIs. I thank God every day that at least I never started those. If you are taking them, I am very sorry. I would do everything possible to research how to effectively taper (you will need to step down to Pepsid, first, according to the reflux experts).

But think about the fact that all antacids cause anxiety, and all of these nutritional issues, for a minute. I mean bad anxiety (and nutritional deficiencies, whether they know it or nor) in many people (these effects get worse, the longer you take them, by the way). Since Pepsid causes all of these things, there is no way in hell that Pepsid itself doesn’t cause reflux!! Unfortunately, Pepsid also causes acid rebound. And therein lies the impossible conundrum, for many.

And that’s all before you start reading about whether reflux causes cancer (which, obviously, would cause some form of anxiety unless you are very mentally hardened, which I am not).

Plus, Dr. Koufman (one of the two leading reflux experts in the world) says that the chances that reflux will cause cancer, and even Barrett’s esophagus causing cancer, are very very low. I know that there are a lot of sources online saying that’s a danger, but I’m going to believe the expert. Focus on healing and calming down.

Read more about my reflux journey, which includes my suggested tips for healing, after thousands of hours and dollars spent trying everything. That page has Amazon links to all of the supplements that I take every day — and that’s after trying MANY brands to find those that are reflux-friendly. Many supplements contain acids that will prevent healing reflux (are we surprised at this point?)

Please note that I am NOT a medical doctor. I am only sharing my experiences & research, after consulting the two leading experts on reflux, countless other doctors and medical practitioners of all sorts, and spending thousands of hours and dollars trying to find a solution. I have managed to improve a great deal, and have no classic LPR symptoms anymore. I just haven’t been able to stop Pepsid, which for obvious reasons, I really want to do. That being said, you absolutely must consult with your own doctor, or do your own research. I am not a doctor and you should NOT take any advice from me without verifying with your doctor!