Causative Organism Identification

Targeted Therapy Starts with the Right Organism

When treating infections—especially in ophthalmology, ENT, dermatology, or wound care—empiric therapy has its limits. Without knowing the specific organism involved, providers risk treatment failure, resistance, or unnecessary side effects.

That’s where we come in.

Precision Compounding Based on Lab Data

At Massey Drugs, we specialize in custom compounded medications guided by causative organism identification. Whether the data comes from:

  • Culture and sensitivity (C&S) reports
  • PCR results
  • DNA sequencing
  • Standard lab diagnostics


Our pharmacists work with you to interpret results and select the most effective, targeted treatment possible.


Why It Matters

Choosing a pharmacy that supports causative organism identification ensures patients receive treatment based on real-world microbial data—not just assumptions. That means:

  • More precise treatment
  • Fewer side effects due to unnecessary or broad-spectrum agents
  • Reduced resistance by avoiding inappropriate antibiotics or antifungals

“When providers share lab results with us, it opens the door to highly specific, patient-tailored therapy. We’re able to recommend formulations that are clinically appropriate based on real data—not guesswork.”

Conditions We Commonly Assist With

We routinely help prescribers treat complex or resistant infections in areas such as:

  • Bacterial and fungal keratitis
  • Recalcitrant sinus infections
  • Post-surgical wound infections
  • Chronic otitis externa
  • Topical antibiotic resistance concerns

What we need from you:

  • A copy of the culture & sensitivity results, lab report, or identified organism.
  • The site of infection and any patient-specific considerations (allergies, tolerability issues, etc.)
  • Your preferred route of administration, or we can recommend one based on the site and organism.

How to Submit a Case

If you have culture results or diagnostic data you’d like us to review, complete our Patient Assessment Request Form on the Practitioner Portal. Our pharmacists will:

  • Review the organism identification and susceptibility data
  • Recommend a formulation, strength, and route based on clinical context
  • Provide guidance on dosing, compatibility, and follow-up needs

Questions? We’re Available.

Our pharmacists are available for one-on-one consultation to discuss unusual organisms, resistant strains, or formulation challenges. We’re here to support your clinical decisions—not replace them.