Doxycycline is a tetracycline antibiotic that doctors use to treat various bacterial infections such as respiratory infections, acne, and certain sexually transmitted infections (STIs).
It’s a generic drug that is also available under brand names like Vibramycin, Acticlate, and Doryx in the United States. Doxycycline comes in different forms including oral tablets, capsules, and liquid suspensions.
Like most medications, doxycycline can cause side effects, which can vary in duration. Some effects may last for a few days, while others could last longer.
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Doxycycline side effects and duration
Like many medications, doxycycline can cause side effects. While most side effects are mild and go away after stopping the medication, some may last longer, especially with prolonged use.
The most common side effects of doxycycline include:
- Nausea and vomiting: These are common early side effects that typically go away within a few days after stopping the medication.
- Diarrhea: Similar to nausea, diarrhea may occur early in treatment and usually goes away after you stop taking doxycycline. If it doesn’t go away, talk with your doctor.
- Photosensitivity: Sun sensitivity can last throughout treatment and up to a week after you stop taking doxycycline. Because of this, it’s important to continue using sunscreen and protective clothing even after your treatment has ended.
- Heartburn or esophageal irritation: These side effects can last a few days and are often related to how you take the medication. To reduce the risk of heartburn or irritation of the esophagus, consider drinking extra water and avoiding lying down immediately after taking doxycycline.
- Weight loss: Weight loss is a rare side effect of doxycycline and is usually linked to gastrointestinal problems such as loss of appetite, nausea, or vomiting. These may indirectly cause weight loss in some people.
- Heart problems: Doxycycline may cause side effects that affect the heart, but this is rare. A 2021 animal study found that it’s possible for doxycycline to affect how well the heart muscle contracts. But the results in animal studies do not indicate similar effects of doxycycline on humans. More research will help validate this.
- Joint pain: A 2022 study found that using tetracycline antibiotics like doxycycline during adolescence and young adulthood may disrupt bone growth. This may lead to joint pain or other bone problems.
Does doxycycline have any long-term side effects?
Doxycycline is generally safe for short-term use, but in rare cases, it may cause long-term side effects, including:
- Dental discoloration: In children under the age of 8 years, doxycycline may cause yellow, gray, or brown tooth discoloration, especially during tooth development.
- Altered gut flora: Long-term use may disrupt the natural bacteria in your gut. This, in turn, could lead to digestive problems such as prolonged diarrhea or infections like Clostridioides difficile (C. diff) and candidiasis.
- Headaches and vision problems: Doxycycline can cause a rare condition called intracranial hypertension. This means that extra pressure inside the skull can cause headaches and vision problems. This condition will usually go away after you stop taking doxycycline.
- Pancreatitis: In rare cases, doxycycline may cause inflammation of the pancreas, resulting in abdominal pain, nausea, or vomiting. if this happens, you may need to stop using the medication.
- Hemolytic anemia: This is a rare reaction that involves doxycycline destroying red blood cells. This may lead to fatigue, pale skin, and shortness of breath.
If you’ve been using doxycycline for a long time, it’s important to talk with your doctor or pharmacist about any side effects that continue even after you have stopped taking the medication.
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Get free cardWhat can you do to avoid side effects with doxycycline?
Taking doxycycline as prescribed, along with some additional steps, may help reduce or avoid its side effects.
- To prevent sun sensitivity, wear protective clothing and use high-SPF sunscreen when outdoors.
- Drink plenty of fluids to reduce the risk of digestive problems or irritation.
- Take doxycycline 1 to 2 hours before bed to lower the risk of irritation of the esophagus.
- Take doxycycline with a meal or a glass of milk to prevent stomach irritation unless your doctor advises otherwise.
- Stay upright (sitting, standing, or walking) for at least 10 to 30 minutes after taking doxycycline to avoid heartburn or irritation of the esophagus.
Summary
Most doxycycline side effects, such as nausea and diarrhea, go away shortly after you stop taking the medication, typically within a few days.
However, in rare cases, more severe or long-term effects may occur, including photosensitivity or irritation of the esophagus.
Taking precautions, such as using sunscreen and taking doxycycline with water, can help reduce side effects. If you experience side effects that don’t go away, talk with your doctor.