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Side effect after taking Flunil 40 mg
Hello Doctor,
I want to inform you about a side effect I am experiencing with Flunil 40 mg. After taking the 40 mg dose, I feel a sharp burning/pain-like sensation below my throat and in the upper chest area. It feels like a sharp pain, but it usually lasts for around 30 minutes after taking the medicine and then settles down.
Around 6–7 months ago, I experienced the same problem when I was taking Flunil 40 mg. At that time, I consulted at J.J. Hospital, and when the dose was reduced to 10 mg, this problem stopped.
Now, I have started taking Flunil 40 mg again as advised by a Practo doctor, and the same throat and upper chest pain/burning sensation has started again. I do not feel stomach irritation; the problem is mainly in the throat and upper chest area after taking the 40 mg dose.
Please advise whether this could be a side effect of the dose and whether any change is needed.
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SSRIs (like Fluoxetine) can cause gastritis/acid reflux like issues as a side effect. It's possible this is what's being experienced currently.
Next Steps
Consult with your treating Psychiatrist, ask if medications like Pantoprazole might be of help.
Health Tips
Consider taking the medication after or during meals.
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“This is most likely due to acid reflux or pill-induced esophageal irritation rather than a serious side effect of fluoxetine itself, especially since it occurs soon after taking the 40 mg dose and has happened before. Take the tablet after food with a full glass of water and avoid lying down for 30–60 minutes. Since symptoms recur specifically with 40 mg, please consult your psychiatrist about reducing the dose or increasing it more gradually.”
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The sharp burning pain in your upper chest and throat occurring shortly after swallowing Flunil 40 mg (Fluoxetine) is a classic manifestation of pill-induced esophagitis or localized mucosal irritation.
Fluoxetine capsules can be directly irritating to the lining of the esophagus if they dissolve too high up or pass through slowly. Taking a higher dose (40 mg, which often comes in a larger capsule size or multiple capsules) increases the likelihood of mechanical or chemical irritation to the esophageal mucosa compared to a smaller 10 mg dose.
Furthermore, SSRIs like Fluoxetine can transiently relax the lower esophageal sphincter, allowing localized gastric acid or dissolved capsule contents to cause a 30-minute burning sensation in the chest area before settling.
Next Steps
Consult Your Psychiatrist to Adjust the Regimen: Inform your doctor about this recurrent side effect. They can adjust your dose back down, split the 40 mg into smaller liquid/dispersible formulations, or switch to an equivalent medication that doesn't cause esophageal irritation.
Take the Pill with a Full Glass of Water: Always swallow Flunil with at least 200–250 mL (a full glass) of water to ensure the capsule washes completely down into the stomach.
Stay Upright After Ingestion: Remain standing or sitting upright for at least 30 minutes after taking the capsule. Never lie down immediately after taking fluoxetine.
Discuss Short-Term Antacids/PPIs: Ask your doctor if taking a temporary proton pump inhibitor (like Pantoprazole) or an antacid prior to your morning dose can help protect your esophageal lining while your treatment plan is being updated.
Health Tips
Do not stop taking Flunil 40 mg abruptly on your own. Abruptly discontinuing or jumping doses of Fluoxetine can trigger discontinuation effects or cause a sudden relapse of your underlying symptoms. Always adjust dosage under medical supervision.
Never Dry-Swallow Capsules: Swallowing capsules with only a sip of water or without liquid increases the risk of the gel capsule adhering to the esophageal wall, causing direct localized ulceration.
Take with Food: Taking your dose in the middle of a meal or immediately after a heavy breakfast can act as a physical buffer, helping push the medication down quickly and reducing upper GI burning.
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