How can I best manage my MAC lung infection at 54?

Question

Hello doctor,

I have been battling a persistent lung infection for over 15 months, and it is not improving despite multiple courses of antibiotics. I am 54 years old, do not have HIV(Human immunodeficiency virus), and have no known immune problems. However, I continue to cough up blood-streaked sputum and am steadily losing weight. This started with what I initially thought was bronchitis, but it never completely resolved.

My chest computed tomography (CT) scan shows multiple cavities and tree-in-bud nodules in both lungs, which have worsened over time. Sputum cultures finally identified Mycobacterium avium complex (MAC) bacteria, which are found everywhere in soil and water.

The infectious disease specialist has prescribed a complicated three-drug regimen consisting of:

Clarithromycin (macrolide antibiotic).
Rifampin (rifamycin antibiotic).
Ethambutol (antimycobacterial agent).

The side effects, however, are severe. I experience constant nausea, intense joint pain, and blurred vision, which I believe is from one of the medications. I have been on this treatment for approximately 10 months, with minimal improvement on follow-up imaging.

I work as a landscaper, so I am constantly exposed to dirt and irrigation systems, which the doctor says might be how I contracted this infection. My wife is terrified that it may be contagious, but the doctors keep reassuring us that it is not transmissible. Over this period, I have lost about 30 pounds and have no energy left for the physical demands of my job.

My concerns are:

How long does treatment typically take for this condition?
Are there any newer antibiotics with fewer side effects?
Will my lung function ever return to baseline?

Kindly help.

Answer 1

Hello,

Welcome to icliniq.com.

I have read your query and can understand your concern.

Thank you for sharing such detailed and important information. What you are going through is an incredibly challenging and prolonged battle, and it is completely understandable to feel frustrated and concerned, especially with such complex side effects and a lack of clear improvement.

To address your questions directly: the standard treatment duration for Mycobacterium avium complex (MAC) lung disease is typically at least 12 months of culture negativity. This means you need to have negative sputum cultures for a full year after they initially turn negative. Given that you have been on treatment for around 10 months without yet achieving culture conversion (as evidenced by worsening scans), the total duration will likely be significantly longer, often extending to 18 to 24 months or more.

This prolonged timeline is, unfortunately, not uncommon, especially in more severe or extensive cases like yours with cavitary disease.

Regarding newer antibiotics, there is promising research on a class of drugs called Bedaquiline (diarylquinoline class) and Delamanid (nitroimidazole class), which were originally developed for drug-resistant tuberculosis. These are not typically first-line treatments but are increasingly being used in refractory cases or when patients cannot tolerate the standard regimen.

Your severe side effects are a major concern. The blurry vision is a known potential toxicity of ethambutol (antimycobacterial agent) that requires immediate ophthalmologic evaluation. The joint pain and nausea you are experiencing are also common, but can be debilitating.

It is critical to report these side effects in detail to your infectious disease specialist immediately. You should not stop the medications on your own, but your regimen may need to be adjusted, dosages changed, or supportive medications added to help manage these effects.

As for your lung function, some of the damage, particularly the cavitary changes, is likely permanent scarring (fibrosis). However, with successful treatment that controls the active infection, inflammation will subside, and you can experience a significant improvement in symptoms, energy levels, and functional capacity.

Pulmonary rehabilitation can also be crucial in helping you regain strength and improve breathing efficiency.

Your wife can be reassured that MAC is not considered contagious from person to person; it is acquired from the environment, which aligns with your occupational exposure.

Given the severity of your case and the treatment challenges, I recommend that you seek a second opinion from a specialist at a major academic medical center with specific expertise in nontuberculous mycobacterial (NTM) lung diseases. Regarding follow-up, I encourage you to remain in close communication with your care team. Please always feel free to reach out at any time.

I hope this helps.

Thank you.