Cialis Heartburn: How Often Tadalafil and Viagra Cause Indigestion
Cialis heartburn and Viagra heartburn, from the labels: indigestion and reflux rates by drug and strength, why it happens, how long it lasts and what to ask.
By Julian Caraulani · Last updated
SafetyReviewed by Dr. A. Goher, MBBS
- FDA-approved and compounded
- LegitScript seal ID shown
- 49 states (not AR)
Below: the label rates by drug and strength, acid reflux on daily Cialis, why ED pills cause it, how long it lasts and what to ask a prescriber. Placebo means a dummy pill with no drug. All label figures were read on DailyMed on 14 November 2026. We do not give doses.
Can Cialis cause heartburn?
Yes. The Cialis label lists dyspepsia among its most common side effects. Dyspepsia means indigestion: a burning or full feeling in the upper belly or chest after eating. Heartburn is the burning part of it.
MedlinePlus, the US National Library of Medicine's drug guide, lists "indigestion or heartburn" among the tadalafil side effects to tell your doctor about if "severe or do not go away" (MedlinePlus: tadalafil, read 14 November 2026).
In the label's eight trials of as-needed use, indigestion rose with tablet strength:
| Cialis as needed | Placebo | Lowest strength | Middle strength | Highest strength |
|---|---|---|---|---|
| Indigestion (dyspepsia) | 1% | 4% | 8% | 10% |
| Headache | 5% | 11% | 11% | 15% |
Source: Cialis label, Table 1, read 14 November 2026.
Acid reflux on daily Cialis
Daily tadalafil is a lower strength taken every day. The label lists both indigestion and gastroesophageal reflux disease, often called GERD or acid reflux, in its daily trials. GERD means stomach acid flows back up into the food pipe.
| Daily Cialis trials | Placebo | Lower daily strength | Higher daily strength |
|---|---|---|---|
| Indigestion, 12-week trials | 2% | 4% | 5% |
| Acid reflux (GERD), 12-week trials | 0% | 2% | 1% |
| Indigestion, 24-week trial | 1% | 4% | 1% |
| Acid reflux (GERD), 24-week trial | 0% | 3% | 2% |
Source: Cialis label, Tables 2 and 3, read 14 November 2026.
In the daily trials for an enlarged prostate, indigestion was 2.4% against 0.2% on placebo. Reflux there was under 1%. The label also lists esophagitis, swelling of the food pipe, among rare reports. Our daily tadalafil cost guide covers the daily option.
- FDA-approved and compounded
- LegitScript seal ID shown
- 49 states (not AR)
Viagra heartburn: does Viagra cause heartburn?
Yes, at similar rates. In the Viagra label's as-needed trials, indigestion hit 7% of men against 2% on placebo (DailyMed: Viagra label). The fixed-strength trials show a steep climb with strength.
| Viagra fixed-strength trials | Placebo | Lowest strength | Middle strength | Highest strength |
|---|---|---|---|---|
| Indigestion (dyspepsia) | 2% | 3% | 9% | 17% |
Source: Viagra label, Table 1, read 14 November 2026.
MedlinePlus lists "heartburn" among the sildenafil side effects too (MedlinePlus: sildenafil). The two labels come from separate trials, so their rates cannot be compared head to head.
Why ED pills cause heartburn
ED pills relax smooth muscle, the muscle you do not control by thought. That is how they let blood into the penis. A ring of smooth muscle at the bottom of the food pipe, the lower esophageal sphincter, normally keeps stomach acid down.
Small studies show ED pills relax that ring. In 8 healthy men, "LES resting pressure significantly decreased after sildenafil infusion" (Rhee et al., Am J Gastroenterol 2001, PubMed). LES is the lower esophageal sphincter. A looser ring can let acid rise and cause a burning feeling.
The evidence is mixed on how much this matters. A second small study in 8 healthy volunteers found sildenafil changed how the sphincter worked, but "Sildenafil did not alter the reflux" in its 2-hour tests (Kim et al., Aliment Pharmacol Ther 2006, PubMed). Both studies were tiny, so treat them as a likely reason, not proof.
How long it lasts
The Cialis patient leaflet says: "The most common side effects with CIALIS are: headache, indigestion, back pain, muscle aches, flushing, and stuffy or runny nose. These side effects usually go away after a few hours." (DailyMed: Cialis label).
Tadalafil stays in the blood longer than sildenafil: its half-life is 17.5 hours, against about 4 hours. Half-life is the time for half of the drug to leave. On daily tadalafil the level stays steady, which may be why reflux showed up in the daily trials.
What to ask the prescriber
Tell the prescriber if heartburn is severe, keeps coming back, or makes it hard to swallow. They may suggest a lower strength, a switch between sildenafil and tadalafil, or a check for reflux disease. Ask a pharmacist before adding an antacid or acid-reducing medicine, so they can check it against your other drugs.
Get urgent care for chest pain, though. Chest pain during or after sex can be the heart, not heartburn, and the ED pill labels take heart symptoms seriously. Our ED pill side effects guide lists every label warning, and the ED pill headache guide covers the other common effects.
What a switch costs
Programs price each drug and strength separately. The table is ranked on our score, with prices from each seller's own page, as checked November 14, 2026.
| Program | Generic sildenafil, per dose | Generic tadalafil, per dose |
|---|---|---|
| Ro | $4 | $11 |
| Rex MD | $1.80 | $6 |
| Strut Health | $1.60 | $2.40 |
| Hims | $4 | $6 |
| Idun Rx | $6 | $6 |
Every strength is on our sildenafil price page and tadalafil price page, and every program is ranked on Best online ED programs.
Questions
FAQ
Does Cialis cause heartburn?
It can. Indigestion is one of the most common Cialis side effects: 4% to 10% of men in as-needed trials, rising with strength, against 1% on placebo. MedlinePlus lists indigestion or heartburn as a tadalafil side effect. The Cialis leaflet says common side effects usually go away after a few hours.
Can Cialis cause heartburn the next day?
Possibly, because tadalafil stays in the body a long time, with a half-life of 17.5 hours. The label does not give a timing for indigestion the way it does for back pain. If heartburn keeps returning the day after a dose, tell the prescriber, who may change the strength.
Does Viagra cause heartburn?
Yes, in some men. The Viagra label reports indigestion in 7% of men against 2% on placebo in as-needed trials, and up to 17% at the highest strength in fixed-strength trials. MedlinePlus lists heartburn among sildenafil side effects. It is usually mild and short-lived.
Does daily Cialis cause acid reflux?
Sometimes. The daily Cialis trials list acid reflux, or GERD, in 1% to 3% of men against 0% on placebo, plus indigestion in up to 5%. Rates were low but present. A man who already has reflux should mention it at the visit.
Why do ED pills cause indigestion?
ED pills relax smooth muscle. Small studies found sildenafil lowered pressure in the ring of muscle at the bottom of the food pipe, which normally keeps acid down. One of them found no change in actual reflux, so the reason is likely but not proven.
Is it heartburn or a heart problem?
Do not guess. Chest pain during or after sex can come from the heart, and both ED pill labels warn about heart risk during sex. Get urgent care for chest pain, especially with shortness of breath, sweating or pain spreading to the arm or jaw.
Check this page with an AI assistant:ChatGPTPerplexityClaude
Not affiliated with OpenAI, Perplexity or Anthropic.