Bedaquiline (BDQ) and Antacids

Why it matters

• Antacids containing aluminum, magnesium, iron, zinc, or calcium chelate fluoroquinolones and markedly reduce their absorption.
• Moxifloxacin (often used alongside BDQ in the BPaLM regimen) should be taken at least 4 hours before or 8 hours after such antacids.
• H2 blockers (like ranitidine/famotidine) do not interfere with moxifloxacin absorption.

For bedaquiline itself

• The WHO companion handbook on bedaquiline notes no specific antacid interaction for bedaquiline directly.
• The known drug interactions for bedaquiline are with CYP3A4 inducers/inhibitors (e.g., rifampicin reduces BDQ levels by ~52%; ketoconazole increases them by ~22%) and with QT-prolonging drugs (clofazimine, moxifloxacin, certain antiretrovirals).
• Standard antacids do not affect CYP3A4 and are therefore unlikely to meaningfully alter bedaquiline blood levels.

Practical recommendation

Always take bedaquiline with a light meal - food improves its absorption. Avoid milk/dairy alongside your TB drugs as calcium can reduce fluoroquinolone absorption.

What's causing your reddish skin color

Why it happens

"As a result of high penetration into many tissues, a reddish-black discoloration of skin and body secretions may occur and take months to years to resolve."

"Patients typically develop a pink to brownish-black discoloration of the skin and should be informed of this in advance."

Key facts about this side effect

What you should do

1. Do not stop your medication. This discoloration is expected and harmless. It does not mean the drug is hurting you.
2. Tell the people around you - it is just a side effect of your TB medicine. You can explain it openly.
3. Let your TB doctor or nurse know at your next visit - they should have counselled you about this at the start. It is routine and well-documented.
4. Sun protection can help - clofazimine also causes some sun sensitivity, so wearing sunscreen or covering up can reduce how noticeable the color change is.
5. Do NOT take extra antacids to try to flush the drug out - as noted in pharmacology data, antacids actually reduce clofazimine absorption by about 30%, which could affect how well your TB treatment works.

Cough Syrup and All-Oral MDR-TB Drugs

The #1 concern: LINEZOLID

⚠️ AVOID these cough syrup ingredients while on linezolid:

✅ Generally SAFER options for cough while on AOL regimen:

Other drugs in your regimen:

• Bedaquiline (BDQ): No major interaction with standard cough syrup ingredients, but avoid anything that prolongs the QT interval.
• Clofazimine: No specific cough syrup interaction.
• Pretomanid: No significant interaction with common cough syrups.
• Moxifloxacin (if in your regimen): Also prolongs QT - avoid anything that can do the same.

Bottom line

Always read the label of any cough syrup before taking it. If it contains dextromethorphan, pseudoephedrine, or phenylephrine - do not take it while you are on linezolid.

Soventus Syrup + Moxifloxacin + Clofazimine

• Levosalbutamol 1 mg/5ml (bronchodilator)
• Ambroxol Hydrochloride 30 mg/5ml (mucolytic - thins mucus)
• Guaiphenesin 50 mg/5ml (expectorant - helps bring up phlegm)

⚠️ IMPORTANT CONCERN: QT Prolongation Risk

What about the other ingredients?

• Ambroxol - generally safe, no significant interaction with moxifloxacin or clofazimine
• Guaiphenesin - safe, no interaction

What should you do?

1. Do NOT take Soventus LS on your own without telling your TB doctor first - the combination with moxifloxacin and clofazimine carries a heart risk.
2. Tell your TB doctor about your cough. They may be able to suggest a safer alternative, such as:
   • Plain ambroxol syrup alone (without the levosalbutamol)
   • Plain guaifenesin (Mucinex plain / glyceryl guaiacolate)
   • Steam inhalation with warm saline
   • Honey and ginger in warm water
3. If you genuinely need a bronchodilator for breathing difficulty (wheeze or breathlessness), your doctor needs to know and monitor your heart (ECG) carefully.

Soventus Jr (Terbutaline + Ambroxol + Guaiphenesin) with Moxifloxacin + Clofazimine

⚠️ Same QT Prolongation Problem - Terbutaline is also on the risk list

What IS safe in Soventus Jr

• Ambroxol - safe, no cardiac or TB drug interaction
• Guaiphenesin - safe, no interaction

What you should do

1. Do not take Soventus Jr alongside moxifloxacin and clofazimine without your TB doctor's approval.
2. If your cough is producing mucus (wet cough), ask your doctor about plain ambroxol syrup alone - it is safe with your TB drugs.
3. If you are having wheeze or difficulty breathing (not just cough), that is a separate medical issue your doctor needs to assess and manage properly - do not self-treat with bronchodilators while on this regimen.
4. For simple dry cough relief, steam inhalation, honey in warm water, or plain glyceryl guaiacolate (guaiphenesin plain) are safe options.

Calcium + Vitamin D3 with Moxifloxacin and Clofazimine

Moxifloxacin - a special exception among fluoroquinolones

"Unlike other quinolones, the extent of MFX absorption remains unaffected by calcium-containing supplements, although the absorption rate may be slightly delayed."

Drug-by-drug summary for your regimen:

One practical tip

Protein Powder Shakes with Your All-Oral TB Regimen

✅ Good news overall - protein shakes are encouraged

Drug-by-drug check:

⚠️ The one thing to check: Linezolid + Tyramine

• Fermented protein hydrolysates
• Yeast extracts
• Aged dairy-based protein concentrates

• Plain whey protein (concentrate or isolate) - not fermented
• Pea protein
• Soy protein isolate (plain, unfermented)
• Egg white protein
• Casein protein (plain)

One bonus benefit - take your TB drugs WITH the shake

Practical summary:

• Plain whey, pea, soy, or egg protein shakes = ✅ Safe and encouraged
• Take your TB drugs with the shake = even better absorption of bedaquiline and clofazimine
• Avoid protein powders with yeast extract, fermented protein, or aged dairy = because of linezolid
• Check your specific brand's ingredient list and if unsure, show it to your TB pharmacist