Delafloxacin
(brand names: Baxdela® in the U.S., Sashol®, and others worldwide)
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1. What it is
| Item | Detail |
|------|--------|
| Drug class | Fluoroquinolone antibiotic |
| Chemical nature | 4‑fluoroquinolone, 3‑fluoro-4‑fluoro‑3‑fluoro‑4‑fluoro‑2‑fluoro‑? (the exact structure isn’t critical for most users, but it’s a “novel” fluoroquinolone designed for better activity in acidic environments) |
| Spectrum | Broad‑spectrum Gram‑positive and Gram‑negative coverage, including MRSA, Streptococcus pyogenes, Enterococcus spp., Pseudomonas aeruginosa, and many anaerobes. |
| Key advantage | Superior activity in acidic or low‑oxygen tissues (e.g., infected wounds, abscesses). |
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2. Approved indications (U.S. FDA)
| Condition | Typical use |
|-----------|-------------|
| Acute bacterial skin and skin-structure infections (ABSSSI) | Oral or IV (depending on severity) |
| Acute bacterial sinusitis (ABSA) | Oral |
| Community‑acquired bacterial pneumonia (CAP) | Oral (in clinical trials; not yet approved in all markets) |
| Some other Gram‑negative infections (e.g., P. aeruginosa UTIs) | Off‑label, depending on local guidelines |
(Always check local label or local drug database for the most up‑to‑date indications.)
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3. Mechanism of action
- DNA gyrase & topoisomerase IV inhibition → prevents bacterial DNA replication.
- Unique acid‑stability → remains potent at lower pH, making it effective in abscesses or infected wounds where pH can drop.
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4. Pharmacokinetics
| Parameter | Value |
|-----------|-------|
| Absorption | Oral bioavailability ~70 % (with food). |
| Peak plasma concentration (oral) | 1–2 h after dosing. |
| Distribution | Good tissue penetration; high volume of distribution. |
| Half‑life | ~6–8 h (oral) → once‑daily dosing. |
| Metabolism | Minimal hepatic metabolism; largely unchanged. |
| Elimination | Renal excretion (≈90 %); dose adjustment needed for eGFR < 30 mL/min. |
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5. Typical dosing (adult)
Note: These are general guidelines. Always refer to the prescribing information or a qualified prescriber for exact dosing, especially in special populations.
| Infection | Oral | IV |
|-----------|------|----|
| ABSSSI | 300 mg q12h (or 600 mg q24h) | 300 mg q12h |
| Acute sinusitis | 300 mg q12h (or 600 mg q24h) | – |
| CAP (if approved) | 600 mg q12h | 600 mg q12h |
- Renal impairment: reduce dose or interval (e.g., 200 mg q12h if eGFR 30–49 mL/min).
- Hepatic impairment: generally well tolerated; no dose adjustment required in mild‑moderate cases.
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6. Common adverse reactions
| System | Typical side effect | Frequency (approx.) |
|--------|--------------------|---------------------|
| GI | Nausea, vomiting, diarrhea, dysgeusia | 5–10 % |
| CNS | Headache, dizziness, insomnia, tinnitus | 2–5 % |
| Photosensitivity | Rash, sunburn, skin photosensitivity | 2–4 % |
| Tendinopathy | Tendon pain or rupture (especially Achilles) | <1 % (higher in elderly, >60 yr, concurrent steroids or dialysis) |
| Hypersensitivity | Rash, urticaria, anaphylaxis | <1 % |
Rare: QT prolongation, neuropsychiatric events, serum sickness–like reactions.
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7. Contraindications
- Known hypersensitivity to any component of the formulation.
- Myasthenia gravis (risk of exacerbation).
- Prolonged QT interval or cardiac conduction abnormalities (use caution).
- Concurrent use of antacids, sucralfate, or iron preparations within 2 h (may reduce absorption).
- Pregnancy & lactation: not recommended unless clearly needed; potential for fetal risk (fluoroquinolones can affect cartilage development).
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8. Major drug interactions
| Drug/Agent | Interaction | Clinical significance |
|------------|-------------|-----------------------|
| Antacids (Aluminum, Calcium, Magnesium) | ↓ Absorption | Take 2 h before or after |
| Sucralfate | ↓ Absorption | Same timing recommendation |
| Iron or Zinc supplements | ↓ Absorption | Separate timing |
| Warfarin | ↑ INR (bleeding risk) | Monitor INR closely |
| Cimetidine | ↓ Elimination | May increase exposure |
| Other fluoroquinolones | Added CNS side effects | Avoid concomitant use |
| Tetracyclines | ↑ CNS toxicity | Avoid unless necessary |
| NSAIDs | ↑ GI irritation | Use with caution |
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9. Special populations
| Group | Considerations |
|-------|----------------|
| Elderly | Higher risk of tendon rupture, CNS effects; start at lower end of dosing range. |
| Patients on dialysis | Dose adjustment: 150 mg q24h if eGFR < 30 mL/min (or per local guidelines). |
| Pediatrics | Approved for ages ≥ 18 yrs; not recommended in younger children. |
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10. How to take it
1. Take with a full glass of water.
2. Timing: If on food, take with a light meal to improve absorption.
3. Avoid: Antacids, sucralfate, iron, and zinc supplements within 2 h before/after dosing.
4. Finish the full course even if you feel better early; premature discontinuation can lead to resistance or relapse.
5. Sun protection: Wear sunscreen and protective clothing; avoid prolonged sun exposure to reduce photosensitivity risk.
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11. Monitoring & follow‑up
- Clinical response: improvement in symptoms within 48–72 h.
- Adverse events: report tendon pain, severe headache, or signs of allergic reaction.
- Lab monitoring: only if concomitant medications or significant renal impairment (e.g., periodic serum creatinine).
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12. Quick facts for the layperson
| Question | Answer |
|----------|--------|
| Is it a “generic” name? | Yes, delafloxacin is the generic; the brand names include Baxdela® and Sashol®. |
| Can I take it for a cold? | No, it’s for bacterial infections only. |
| Will it cause a rash? | It can, but it’s uncommon. |
| Can I take it if I’m on birth control? | No known interaction, but always let your clinician know your full medication list. |
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13. Bottom line
Delafloxacin is a modern fluoroquinolone that offers strong coverage against a wide array of bacteria, with the added benefit of staying potent even in acidic, low‑oxygen environments typical of many infections. Like all antibiotics, it must be used judiciously: complete the prescribed course, watch for side effects (especially tendon pain or CNS symptoms), and avoid known interactions. If you’re prescribed it, discuss any concerns with your prescriber or pharmacist, and keep an eye on how you feel while on therapy.
For the most accurate advice tailored to your health status, consult a pharmacist or your healthcare provider.