What alternative therapies are available for MAC lung disease?

Question

Hello doctor,

My 45-year-old wife has been battling MAC (Mycobacterium avium complex) lung disease for over a year, and it is not improving despite multiple antibiotics. She was diagnosed after experiencing a persistent cough and significant weight loss, 25 pounds in four months.

Her pulmonologist has her on Clarithromycin, Ethambutol, and Rifampin for 10 months, but a recent CT (computed tomography) scan still shows nodules and cavities in both lungs. Her sputum cultures remain positive for MAC despite this prolonged treatment.

Unfortunately, she has developed hearing loss from Ethambutol, which makes communication difficult. She also experiences severe nausea and stomach pain from Rifampin, making it hard to eat properly.

Before her MAC diagnosis, she was a healthy marathon runner, but now she is short of breath even walking upstairs. Her menstrual cycles have become irregular, likely due to weight loss and stress on her body.

Amikacin injections were added three times a week but had to be stopped because of changes in kidney function.

Are there alternative treatment options for MAC lung disease that might be more effective? I am very worried that this infection may never resolve.

Please help.

Answer 1

Hello,

Welcome to icliniq.com.

I have read your query and understand your concern.

In day-to-day pulmonary practice, situations like this with MAC (Mycobacterium avium complex) lung infection do occur. The infection can be very stubborn despite correct antibiotic therapy, and this does not imply that anything was done incorrectly.

The combination she has received is the standard initial treatment. When cultures remain positive after many months, this is considered a difficult or refractory form of the disease.

Cavities in the lungs are especially challenging because antibiotics do not reach these areas as effectively. Low body weight and poor nutrition further weaken the body’s ability to clear the infection, often slowing progress.

The side effects you described are very important. Hearing problems, severe stomach intolerance, and kidney strain often require rethinking the treatment plan. For patients who cannot tolerate injectable Amikacin, inhaled Amikacin can be considered.

This targets the lungs directly and is generally easier on the kidneys and ears, though suitability must be evaluated by a specialist experienced in complex MAC cases.

Another practical step is reviewing current medications rather than continuing them unchanged. Sometimes switching from Clarithromycin to Azithromycin improves tolerance without reducing effectiveness.

Doses may also need adjustment as body weight changes. Aggressive attention to nutrition is equally important, as improving calorie intake and weight can enhance energy levels, help regulate menstrual cycles, and support the body’s ability to cope with long-term infection.

It is also important to set realistic expectations. MAC lung disease is often a long-term condition, and clearance can take longer than a year in some patients. Many people do improve with careful therapy adjustment and supportive care, even after a slow start.

I hope this answers your questions. Please follow up if you need further guidance.

Thank you.