Compounded hair loss formulas look different from standard commercially manufactured prescriptions — the labels are denser, the terminology more technical, and the concentration parameters less standardized. Learning to read them accurately reduces both confusion and clinical risk.
The Anatomy of a Compounded Prescription Label
A typical compounded hair topical label includes: the dispensing pharmacy's name and contact, the patient name and prescribing clinician, the medication name and concentration(s), the base/vehicle description, the quantity dispensed, directions for use, and lot number and beyond-use dating. Here is what each section tells you.
Drug Name and Concentrations
Common compounded hair formulas include:
- Topical Finasteride: Typically 0.1% or 0.25% in a solution or gel vehicle. Concentration matters — 0.25% delivers more finasteride per dose than 0.1%, with different systemic absorption profiles.
- Topical Minoxidil: Typically 2%, 5%, or 7.5% solution or foam-like gel. The compounded vehicle often differs from the commercial product, affecting absorption kinetics.
- Combination Formulas: "Finasteride 0.1% / Minoxidil 5% Topical Solution" means both drugs in one application. The concentration of each applies to the combined formula.
- Topical Dutasteride: Typically 0.1% or 0.25%, same logic as finasteride.
If the label says "Apply 1 mL once daily" and the formula is "Finasteride 0.1% topical solution," you're applying 1 mg of finasteride topically per dose (0.1% of 1 mL = 0.001 g = 1 mg). Understanding this calculation lets you verify you're receiving the clinically intended dose.
The Vehicle (Base)
The vehicle — the carrier liquid in which the active drug is suspended — affects absorption, scalp feel, and stability. Common vehicles include:
- Propylene glycol (PG): A common solvent in commercial minoxidil. Effective penetration enhancer; can cause irritation in sensitive individuals.
- Ethanol: Rapid evaporation, good active drug delivery, more likely to cause scalp dryness.
- PM-gel / Lipoderm: Proprietary gel bases marketed as improving penetration and reducing irritation. Not all compounders have the same base formulations.
- Water-based: Gentler but may have lower active drug penetration depending on specific formulation.
Beyond-Use Dating
Compounded medications carry "beyond-use dates" rather than the "expiration dates" of commercially manufactured drugs. These are assigned based on stability testing guidance from USP (United States Pharmacopeia) standards for the drug, container, and storage condition — not years of stability data like a commercially manufactured product. Store compounded topicals as directed (typically refrigeration is not required but cool/dark storage is), and do not use beyond the stated beyond-use date.
| Label Element | What It Tells You | Red Flag If Missing |
|---|---|---|
| Active drug name + % | Drug and concentration | Label is non-compliant |
| Vehicle description | Carrier base | Not standard — ask pharmacy |
| Quantity + directions | Daily dose calculation | Cannot verify dose |
| Beyond-use date | Shelf life | Do not use product |
| Pharmacy contact + Rx number | Dispensing provenance | Cannot verify authenticity |
Asking the Right Questions of Your Pharmacy
Any licensed compounding pharmacy should be able to answer: what is the beyond-use date and how was it assigned; what stability testing underlies it; what does the vehicle contain; and is the pharmacy PCAB-accredited or 503A/503B-registered. A pharmacy that cannot answer these questions clearly should prompt a request for transfer to a more transparent provider.