Lyme disease is treated with antibiotics, and most people who are diagnosed early recover rapidly and completely with a 10- to 14-day course of oral medication. The specific antibiotic, dosage, and duration depend on how far the infection has progressed and which parts of the body are affected. Treatment can also begin before symptoms appear if you’ve recently been bitten by the right kind of tick in the right kind of area.
Preventive Treatment After a Tick Bite
If you find a blacklegged tick (also called a deer tick) attached to your skin, you may be able to prevent Lyme disease entirely with a single dose of doxycycline taken within 72 hours of removing the tick. The Lyme bacteria need at least three days to incubate, so this narrow window is when preventive treatment works best.
Not every tick bite warrants this step. The decision depends on several factors: whether you’re in an area where blacklegged ticks commonly carry the Lyme bacterium, whether the tick was actually a blacklegged tick, and whether the tick was engorged with blood. A flat, unfed tick is unlikely to have transmitted the infection. An engorged tick, one that’s visibly swollen, signals a longer attachment time and a higher risk of transmission. If all those boxes check out and it’s been fewer than 72 hours, a single 200 mg dose of doxycycline for adults (or a weight-based dose for children) is the standard recommendation.
Early Lyme Disease: First-Line Antibiotics
The hallmark of early Lyme disease is the expanding red rash known as erythema migrans, which appears at the site of the bite in roughly 70 to 80 percent of infected people. Once that rash shows up, or if blood tests confirm an early infection, oral antibiotics are the go-to treatment. Three options are considered equally effective:
- Doxycycline: 100 mg twice daily for 10 to 14 days. This is often preferred because it also covers other tick-borne infections that can tag along with Lyme.
- Amoxicillin: 500 mg three times daily for 14 days. A common alternative for people who can’t take doxycycline.
- Cefuroxime: 500 mg twice daily for 14 days. Used when neither of the first two options is suitable.
When guidelines offer a range, the shorter course is generally preferred to reduce side effects like digestive problems and to limit antibiotic resistance. Children receive weight-based doses of the same medications, with doxycycline now considered safe for children of any age in short courses, a change from older guidance that restricted it to kids over eight.
What the First Days of Treatment Feel Like
Some people feel temporarily worse before they feel better. This is called a Jarisch-Herxheimer reaction, and it happens when antibiotics kill off a large number of bacteria at once, triggering a burst of inflammation. Symptoms can include fever, chills, muscle pain, headache, a faster heart rate, and sometimes a new or worsening rash. It typically starts within the first day or two of treatment and resolves on its own.
Over-the-counter pain relievers usually help manage the discomfort. In more pronounced cases, a doctor may recommend a short course of anti-inflammatory medication or IV fluids. The reaction is not a sign that treatment is failing. It’s actually evidence that the antibiotics are working. If your symptoms get noticeably worse after starting treatment, it’s still worth checking in with your provider to make sure nothing else is going on.
Treatment for Later-Stage Lyme Disease
When Lyme disease isn’t caught early, the bacteria can spread to the nervous system, joints, or heart. Treatment at this stage is more intensive.
Neurological Lyme Disease
If the infection reaches the nervous system, causing problems like facial paralysis, meningitis, or nerve pain, treatment typically involves intravenous antibiotics for 14 to 21 days. Patients who are hospitalized usually start with IV therapy and then transition to oral antibiotics to finish the course. The shift to oral medication shortens hospital stays and reduces the risks associated with long-term IV lines.
Lyme Carditis
In rare cases, the bacteria infect the heart tissue and disrupt the electrical signals that control your heartbeat. This can cause lightheadedness, fainting, or shortness of breath. Treatment follows the same pattern as neurological Lyme: IV antibiotics initially, transitioning to oral, for a total of 14 to 21 days. Most people with Lyme carditis recover fully once the infection is cleared.
Lyme Arthritis
Joint swelling, particularly in the knees, is one of the most common signs of later-stage Lyme disease. This is usually treated with a 28-day course of oral antibiotics. Most cases resolve with one round of treatment, though some people need a second course if joint inflammation persists.
When Symptoms Linger After Treatment
Most people bounce back quickly after completing antibiotics, especially if they were treated early. But a subset of patients continue to experience fatigue, pain, or cognitive difficulties for weeks or months afterward. This is sometimes called Post-Treatment Lyme Disease Syndrome, or PTLDS.
The cause isn’t fully understood. The active infection appears to be cleared, but the body’s inflammatory response may take time to settle. Multiple clinical trials in the U.S. have tested whether extended courses of antibiotics help these lingering symptoms. The consensus from major medical organizations, including the Infectious Diseases Society of America, the American Academy of Neurology, and the European Federation of Neurological Societies, is that prolonged antibiotic therapy has not shown sustained benefit for PTLDS. One trial did find that IV antibiotics improved fatigue, but the risks of long-term IV treatment (including serious infections from the IV line itself) outweighed the benefits, so it’s not recommended as a standard approach.
For people living with persistent symptoms, management typically focuses on treating each symptom individually: physical therapy for joint stiffness, sleep support for fatigue, and cognitive strategies for brain fog. Symptoms do improve over time for most people, though the timeline varies.
Co-infections From the Same Tick Bite
Blacklegged ticks can carry more than just the Lyme bacterium. The same bite that transmits Lyme can also deliver other pathogens that cause anaplasmosis or babesiosis. These infections produce overlapping symptoms like fever, fatigue, and muscle aches, which can make Lyme disease appear more severe or cause symptoms that don’t quite fit the typical pattern.
Doxycycline, the most commonly prescribed antibiotic for Lyme, also treats anaplasmosis, which is one reason it’s often the first choice. Babesiosis, however, is caused by a parasite rather than a bacterium and requires a different set of medications. If you’re being treated for Lyme disease and your symptoms aren’t improving as expected, or if you have high fevers and significant fatigue that seem out of proportion, co-infection is something your provider should consider. Testing is straightforward, and treatment for these additional infections is well established.