If you were diagnosed with Lyme disease yesterday, asking which antibiotic you should take is exactly the right question.

If you have been sick for three years, have already taken doxycycline, amoxicillin, perhaps IV antibiotics, along with several antimicrobial herbs, and you are still sick, we need to ask a larger question.

What is keeping you sick now?

Early Lyme is primarily an infection we treat with antibiotics. Months or years later, Borrelia may still be part of the picture, but the infection has also interacted with the person it infected.

Over time, that can become an intricate dance between the bug and the patient.

Acute Lyme Disease: Antibiotics Matter

Lyme disease is caused by Borrelia bacteria. When recognized early, antibiotics are the established treatment, and most people treated appropriately in the early stages recover rapidly and completely.[1]

For uncomplicated early Lyme disease, the antibiotics most commonly used are doxycycline, amoxicillin, and cefuroxime.[1]

How long they should be given is less settled.

CDC guidance, following the IDSA/AAN/ACR guidelines, lists doxycycline for 10 to 14 days, or amoxicillin or cefuroxime for 14 days, for an adult with an erythema migrans rash.[1,2]

The International Lyme and Associated Diseases Society, or ILADS, interprets the evidence differently. Its guideline recommends an initial 4 to 6 weeks of doxycycline, amoxicillin, or cefuroxime for most patients with erythema migrans, followed by reassessment.[3]

The disagreement reflects different interpretations of an imperfect evidence base, including how each group weighs treatment failure, antibiotic risk, clinical response, and individualized treatment. ILADS rates much of the evidence underlying these treatment questions as very low quality and places greater emphasis on clinical judgment and shared decision-making.[3]

The clinical manifestation matters as well. Neurologic Lyme disease, Lyme carditis, Lyme arthritis, pregnancy, medication tolerance, co-infections, and other circumstances can change the antibiotic, route, or duration being considered.[2]

There is no single “best antibiotic for Lyme.” The treatment has to fit the Lyme disease being treated and the person who has it.

What If the Antibiotics End and You Are Still Sick?

This is where the question changes.

Perhaps you were treated promptly but never returned to your previous health. Perhaps Lyme was not recognized until months later. Or perhaps you have already received several courses of antibiotics and antimicrobial herbs. Some helped. Others did nothing. You may even have improved during treatment only to become sick again afterward.

Yet you are still exhausted. Your thinking is not what it used to be. Exercise can put you in bed the next day. Sleep has changed. You may have migrating pain, neuropathy, dizziness, palpitations, gastrointestinal problems, or a growing list of things your body no longer seems to tolerate.

I have met many people at exactly this point.

For them, “Which antibiotic should I take next?” is no longer the only question.

Is Borrelia Still There?

This remains one of the central scientific disagreements in Lyme disease.

CDC uses the term Post-Treatment Lyme Disease Syndrome, or PTLDS, for prolonged symptoms following recommended treatment. CDC points to clinical trials that have generally not found extended antibiotic treatment superior to placebo for prolonged nonspecific symptoms and emphasizes the risks of long-term antibiotic therapy.[4]

ILADS interprets the retreatment evidence differently. Its guideline recommends evaluating other potential causes while also considering additional antibiotic treatment when persistent Lyme infection may be contributing to ongoing illness and quality of life is impaired. In one randomized retreatment trial of patients with severe persistent fatigue, 64% of those receiving additional antibiotic therapy achieved what the investigators defined as clinically significant and sustained improvement in fatigue. ILADS also points to the Krupp and Fallon trials and subsequent reappraisals of the U.S. retreatment studies as evidence that some outcomes and patient subgroups showed benefit that can be obscured when the trials are summarized simply as negative. Treatment is individualized and reassessed according to clinical response, benefit, and risk.[3,5]

The persistence question remains scientifically open. Borrelia can survive antibiotic exposure under some laboratory conditions. Persistence has been demonstrated in animal models, and Borrelia material has been identified in some human tissues after treatment.

I use a broader term for the prolonged illness that can follow Lyme: Post-Acute Sequelae of Lyme, or PASL.

PASL: The Dance Between the Bug and the Patient

An infection occurs inside a living system, and both sides of that system can adapt.

As Borrelia interacts with the person it infects, the immune system responds, the nervous system changes its regulation, metabolism shifts to meet the demands of illness, and tissues attempt to contain injury and repair themselves.

Borrelia also has biological strategies that can make it difficult to eliminate. I group these under what I call Stealth Pathology: mechanisms such as tissue sequestration, immune evasion, altered metabolic states, biofilm-associated communities, and changes in gene and protein expression that may help the organism tolerate a changing and sometimes hostile environment. These mechanisms are described to varying degrees in laboratory and animal research.

The host is adapting as well. Many of these responses begin as protection. Inflammation helps defend against infection. Fatigue reduces energy expenditure during illness. Increased autonomic vigilance may help the body respond to threat.

With prolonged illness, microbial survival strategies and host adaptations can begin interacting. The organism influences the terrain, the terrain influences the organism, and both influence what happens next.

This is the intricate dance between the bug and the patient.

The balance of that dance can be different from one person to another. Persistent microbial pressure may dominate one person's illness, while host adaptations may dominate another. Several may be operating together.

By then, two people who began with the same infection may no longer have the same illness.

That is what I mean by Post-Acute Sequelae of Lyme.

Where Antibiotics Fit in PASL

Antibiotics act against susceptible bacteria. When ongoing Borrelia, another tick-borne bacterial infection, or another bacterial process is contributing to the illness, antimicrobial treatment addresses that part of the map.

But PASL is the interaction we have just described. Treating Stealth Pathology does not necessarily resolve the host adaptations that have developed alongside it.

The treatment has to match the map.

Why I Developed Precision Lyme Management

For years I taught about chronic infection for the Institute for Functional Medicine. Physicians from around the world began referring some of their most difficult cases to me.

Many of these patients had already done what I was teaching. They had received extensive antimicrobial and Functional Medicine treatment, yet they were still sick.

I had to stop looking for the next protocol and start looking for patterns.

Gradually, a map emerged.

It became Precision Lyme Management, or PLM.

PLM maps five interconnected domains: Antecedents, Stealth Pathology, Host PASI, Resilience, and Healing Fields. Within them are dozens of variables describing both the pathogen and the person who has been adapting to it.

The question changes from “What treatment comes next?” to “Where are you on the map now?”

Because a diagnosis tells us how you resemble other people with that diagnosis.

The PLM map tells us what the illness has done to you.

So, What Antibiotic Should You Take for Lyme Disease?

For acute Lyme disease, antibiotics are central to treatment. Doxycycline, amoxicillin, and cefuroxime are commonly used, while the appropriate drug, duration, and route depend upon the clinical situation. Major guidelines differ on some treatment durations.[1-3]

If you have been sick for months or years despite treatment, the question becomes larger:

What is keeping me sick now?

Antibiotics may be part of that answer. The rest requires understanding the terrain.

That is why chronic Lyme needs more than a protocol.

It needs a map.



References

1. Centers for Disease Control and Prevention. Clinical Treatment of Erythema Migrans Rash. Updated March 27, 2026.
2. Lantos PM, Rumbaugh J, Bockenstedt LK, et al. Clinical Practice Guidelines by the Infectious Diseases Society of America, American Academy of Neurology, and American College of Rheumatology: 2020 Guidelines for the Prevention, Diagnosis and Treatment of Lyme Disease. Clinical Infectious Diseases. 2021;72:e1-e48.
3. Cameron DJ, Johnson LB, Maloney EL. Evidence Assessments and Guideline Recommendations in Lyme Disease: The Clinical Management of Known Tick Bites, Erythema Migrans Rashes and Persistent Disease. Expert Review of Anti-infective Therapy. 2014;12:1103-1135. International Lyme and Associated Diseases Society treatment guidelines.
4. Centers for Disease Control and Prevention. Chronic Symptoms and Lyme Disease. Updated June 26, 2026.
5. International Lyme and Associated Diseases Society. Statement on Guidelines. 2024.