How Long Do Doxycycline Side Effects Last?

Doxycycline, like many antibiotics, can cause certain side effects, including upset stomach, skin rashes, or light sensitivity, among others. Usually, side effects from doxycycline can last for as little as a few days up to a few weeks, depending on the length of treatment and dosing.

The Role of Doxycycline in Treating Infections

Doxycycline is often used to treat various bacterial infections, including:

Unlike some antibiotics, tetracyclines such as doxycycline prevent bacteria from multiplying by blocking protein production, rather than killing them directly.

It’s important to follow your healthcare provider’s prescription for doxycycline, as the number of treatment days can vary with the type of infection.

The dosage usually depends on your age and reason for taking it. Adults typically start with 200 milligrams (mg) on the first day, followed by 100 mg once or twice daily based on the infection’s severity. Children’s doses are weight-based if they weigh less than 100 pounds; those weighing more receive adult doses.

Doxycycline is effective only against bacterial infections and does not treat viral infections.

Common and Serious Doxycycline Side Effects

Common side effects of doxycycline may include:

• Nausea, vomiting, or diarrhea 
• Skin rashes 
• Headaches
• Throat irritation

More serious side effects can include: 

Side Effects in Children

When giving doxycycline to children, discuss potential dental risks with their healthcare provider. In children under 8, it can cause tooth staining, turning teeth a yellow-gray-brown color. This is more likely with long-term use (over 21 days) or repeated short courses.

Taking doxycycline during pregnancy may affect the fetus, leading to teeth discoloration after birth.

Long-Term Side Effects

You should not take doxycycline for longer than prescribed by your healthcare provider. Depending on your infection, you may take doxycycline for longer periods.

Studies have suggested that the use of doxycycline longer-term (eight weeks) is generally safe in adults, with some mild side effects.

However, long-term use of more than 21 days of doxycycline in children under 8 has been linked to permanent teeth discoloration. For this reason, only use doxycycline in severe cases when other alternative therapies aren’t available.

If you are nursing, you should keep your doxycycline course to less than 21 days and avoid repeat treatment. Breastfeeding while taking doxycycline for long periods can lead to teeth staining in the infant. Other negative side effects in the infant can include rash and diarrhea.

If you plan to use doxycycline long-term, like for acne treatment, routine blood tests may be necessary. Some side effects reported include kidney damage and blood concentration changes.

When Will the Side Effects Go Away?

Mild side effects, such as an upset stomach or diarrhea, often resolve a few days after stopping doxycycline. More severe symptoms, like photosensitivity, may take about a week to clear.

Contact your healthcare provider if you experience diarrhea or bloody stools months after stopping doxycycline, as this could signal a serious complication known as C. difficile infection.

How to Cope With Side Effects

In some cases, you can manage mild side effects from doxycycline on your own:

• Upset stomach or nausea: Taking doxycycline with food may help reduce the amount of irritation in your stomach. Do not take doxycycline at the same time as calcium-containing foods or antacid tablets because that can cause doxycycline not to work in the body. 
• Photosensitivity: Try to avoid staying in direct sunlight for too long. Wearing sunscreen with long-sleeved clothing and hats can prevent more irritation to your skin. If you start to develop rashes, let your healthcare provider know. They may want you to stop taking your medication. If your nails begin to lift from their nail plates, it may also be a reaction from the sun and doxycycline, whereby your nails are sensitive to light, causing them to lift. Usually, when you stop taking doxycycline, your body will no longer be as sensitive to sunlight, and you should see a new nail growing in afterward. 
• Throat irritation: Making sure you drink a full glass of water after taking your dose may help reduce some of the irritation and burning in your throat. You can also break the capsule and sprinkle it over soft foods like applesauce to make it easier to swallow. However, do not crush the granules in the capsule as you pour it on your food. Doing so will reduce how well the medication works.

When to See a Healthcare Provider

Often, your side effects may be mild, or you might not experience any. However, it’s crucial to know when to seek advice from your healthcare provider regarding medication-related side effects.

Contact your healthcare provider if:

• You still have diarrhea after stopping doxycycline. This could be a rare but serious infection called C. difficile, causing painful cramping and severe diarrhea that requires more antibiotics.
• You develop a rash that doesn’t improve after stopping the medication.
• You finish your treatment and still don’t feel better. A different antibiotic might be needed.