Dermatology Compounding: When It Helps and When It Doesn't

Compounded dermatology preparations get marketed as “custom skincare,” which is a poor description of what they are and why prescribers order them. Compounding solves a specific, fairly short list of problems. When one of those problems is present, it is often the only practical answer. When none of them is present, an FDA-approved product is the better choice, and a good pharmacy will say so.

This is a guide to which problems those are, what compounding cannot do, and the parts of the topic — vehicles, excipients, beyond-use dating — that actually determine whether a topical works.

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Five reasons a dermatologist orders a compounded preparation

1. The strength isn't manufactured

Tretinoin is sold at 0.025%, 0.05% and 0.1%. A patient who cannot tolerate 0.05% but gets nothing from 0.025% has no commercial option in between. The same gap appears with hydrocortisone, where the jump from an over-the-counter 1% to a prescription 2.5% is the only step available. Compounding fills in the intermediate strengths, and it allows a prescriber to titrate down when irritation is the limiting factor rather than potency.

2. Several agents need to be in one vehicle

A regimen of three separate products applied at different times is a regimen many people abandon. Combining the agents into a single preparation is often the difference between a treatment that gets used and one that sits in a drawer. The best-known example in dermatology is the triple combination for melasma — hydroquinone with a retinoid and a corticosteroid, sometimes called the Kligman formula — which has been used in this form for decades.

Adherence is the honest justification here. It is not a claim that the combination is pharmacologically superior to the same agents applied separately.

3. The vehicle needs to match the site

This is the most underappreciated reason, and it is covered in its own section below. A corticosteroid that works well on a thick plaque on the elbow is the wrong choice for the scalp, the face, or a skin fold — not because the drug is wrong, but because the base is.

4. The patient reacts to an ingredient

Contact allergy to an excipient rather than to the active drug is common and frequently missed. Propylene glycol, a solvent in a great many topical products, was named Allergen of the Year by the American Contact Dermatitis Society in 2018. Formaldehyde-releasing preservatives, fragrance, lanolin, and benzyl alcohol are also well-documented sensitizers.

A patient with patch-test-confirmed sensitivity may have no commercial product they can use. Compounding the same active drug into a base free of that specific ingredient is a direct solution to a problem no manufacturer will solve for one person. If you have had patch testing, bring the results — the pharmacy needs the specific allergen names to build around them.

5. The commercial product is discontinued or unavailable

Products are withdrawn for commercial reasons that have nothing to do with whether they worked. When a preparation a patient has done well on leaves the market, compounding can reconstruct it.

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What compounding does not do

An honest account has to include this list, because a great deal of marketing in this field implies otherwise.

• It does not make a drug more effective. Compounded tretinoin is tretinoin. The advantage, when there is one, comes from strength, vehicle, combination, or excipients — not from the compounding itself.
• Compounded preparations are not FDA-approved. The FDA has not evaluated them for safety, for effectiveness, or for manufacturing quality. That is true of every compounded preparation, including everything described on this page.
• Potency and stability are not verified batch by batch the way a manufactured product's are. Compounding pharmacies work to USP standards and to the formula record, but there is no premarket testing program behind an individual prescription.
• It usually is not covered by insurance. Compounded preparations are frequently excluded from pharmacy benefits outright. Ask for the cash price before assuming a copay.
• It cannot legally be a copy of an available product. Under section 503A of the Federal Food, Drug, and Cosmetic Act, a compounded drug may not be essentially a copy of a commercially available drug product. If a prescriber determines that a change — a different strength, the removal of an allergen — makes a significant difference for a particular patient, that is a different matter, and the reason belongs on the prescription.

None of this argues against compounding. It argues for using it where it answers a real problem, which is the whole of the case for it.

The vehicle matters as much as the drug

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The base a drug is dispersed in determines how much of it reaches the skin, how it feels, whether the patient will keep using it, and — for corticosteroids — how potent the finished product is.

The consequence people miss: the same corticosteroid molecule is more potent in an ointment than in a cream. Occlusion increases penetration. This is why topical steroid potency classes are assigned to finished products rather than to molecules, and why a formulary lists the same drug in two different classes depending on its base. The seven-class potency chart on our fluocinonide and triamcinolone pages sets this out in full.

Site matters for the same reason. Facial skin, eyelids, and skin folds are thin and absorb far more than the palms or soles; a potency appropriate for a plaque on the shin can cause atrophy on the face. Matching potency and vehicle to the site is most of the skill in prescribing a topical steroid.

Preparations commonly compounded in dermatology

Everything in this section is compounded to a prescriber's order and is not FDA-approved.

Acne

Combination gels bring a retinoid, an antibiotic, and other agents into one nightly application. Our tretinoin, niacinamide and hyaluronic acid gel is one example; the acne page covers the range.

Two practical notes. Clindamycin and benzoyl peroxide work by different mechanisms — clindamycin is an antibiotic, benzoyl peroxide is antibacterial and mildly keratolytic — and benzoyl peroxide is included in combinations partly because it reduces the development of antibiotic resistance. And higher is not better with benzoyl peroxide: strengths above roughly 10% have not been shown to work better than 2.5% to 5%, while irritation rises steadily with concentration. Independent testing reported in 2024 also raised questions about benzene forming in benzoyl peroxide products stored at high temperatures, prompting FDA testing and a small number of recalls; the practical advice is to store these products at room temperature rather than in a hot car or a steamy bathroom.

Melasma and hyperpigmentation

See our melasma and dark spots and hydroquinone blends pages. The regulatory position here is worth knowing before you start: the CARES Act removed over-the-counter hydroquinone from the market effective September 23, 2020, and prescription hydroquinone products in the United States are not FDA-approved. Prolonged use carries a risk of exogenous ochronosis, a paradoxical blue-black discoloration that is difficult to reverse, which is why these preparations are normally used in defined courses rather than indefinitely, and why sun protection is part of the treatment rather than an afterthought.

Eczema and inflammatory dermatoses

Topical corticosteroids in a strength and base matched to the site, and steroid-sparing options such as compounded tacrolimus for areas where long-term steroid use is a problem — the face, eyelids, and skin folds in particular. Triamcinolone and fluocinonide sit at opposite ends of the potency range and illustrate how much the choice matters.

Rosacea

See rosacea and facial redness. Vehicle choice carries extra weight here, since rosacea-prone skin is often intolerant of alcohol, propylene glycol, and fragrance — an instance where the excipient question above is the whole problem.

Fungal and nail conditions

Ciclopirox in various strengths and vehicles. Nail infections are slow: a toenail takes roughly nine to twelve months to grow out, so judging a topical antifungal before then is judging it early.

Combination antimicrobial and anti-inflammatory creams

Preparations such as our mupirocin, betamethasone and miconazole cream are used where infection and inflammation coexist and the diagnosis is mixed or uncertain. These are for defined courses, not maintenance — prolonged use of a topical antibiotic promotes resistance, and prolonged use of a steroid on an untreated fungal infection makes it worse and harder to recognize.

Hair loss

See hair loss and our minoxidil and finasteride scalp preparations. Two safety points belong with any discussion of these:

• Topical finasteride is not FDA-approved — only oral finasteride is — and it is absorbed systemically rather than acting only where it is applied.
• Finasteride is contraindicated in pregnancy and in women who may become pregnant. It can cause abnormalities of the external genitalia in a male fetus. Women who are or may become pregnant should not use it and should not handle a leaking container or broken tablets. This applies to the topical form.

Minoxidil works for some people and not others, takes three to six months to show anything, and stops working when it is stopped — the hair gained is lost over the following months. That is worth knowing before starting rather than after.

Procedural anesthesia

Compounded topical anesthetics such as BLT cream are used before dermatologic procedures. FDA issued a warning on March 26, 2024 about compounded topical anesthetics, and the risks it described are real: applying too much, to too large an area, or under occlusion can produce systemic absorption at dangerous levels. Follow the amount and timing on the label, apply a thin layer, and do not wrap the area unless your prescriber specifically told you to.

Molluscum and warts

Cantharidin is a long-standing example of the 503A question in action. It was compounded for decades without an approved product existing; an FDA-approved cantharidin product for molluscum has since become available, which changes the analysis for that indication. This is exactly the situation where the prescriber's reason for wanting a compounded preparation, rather than the approved one, needs to be on the prescription.

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A correction worth making about scalp conditions

Seborrheic dermatitis and dandruff are not caused by an accumulation of dead cells that needs to be removed, and vitamins and minerals do not treat them. The condition is associated with Malassezia, a yeast that is part of normal skin flora, and with the skin's inflammatory response to it. Treatment is antifungal — ketoconazole, ciclopirox — often with a keratolytic such as salicylic acid to lift scale, and a topical corticosteroid for flares. Compounding is useful here mainly for getting those agents into a solution or foam that can actually be applied to a hair-bearing scalp, which is a vehicle problem rather than a formulation-secret one.

Beyond-use dates: why compounded products expire quickly

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A compounded preparation carries a beyond-use date, not a manufacturer's expiration date. The distinction is real: an expiration date rests on stability testing of that specific product, while a beyond-use date is a conservative limit set by standards and by the pharmacist's judgment.

USP General Chapter <795> sets default limits for non-sterile compounded preparations. Water is the variable that matters most, because it supports microbial growth: non-aqueous preparations get substantially longer dating than water-containing ones. Preservatives extend it; the actual date assigned may be shorter than the default if an ingredient's stability calls for it.

Practical implications: buy the quantity you will use within the dating, store it as labeled, don't decant it into another container, and don't keep a tube past its date on the assumption that a drug lasts as long as a manufactured one would.

Questions people ask

Is a compounded topical stronger than what I can buy?

It can be made at a strength that isn't sold commercially, which is not the same as being stronger in effect. For several agents — benzoyl peroxide is the clearest case — higher concentrations bring more irritation without more benefit.

Are compounded dermatology preparations FDA-approved?

No. FDA has not evaluated them for safety, effectiveness, or manufacturing quality. This is a factual statement about the regulatory status, and it applies to all compounded preparations.

Do I need a prescription?

Yes. Compounded preparations are prescription medications, dispensed for a named patient on a prescriber's order.

Why did my dermatologist choose a cream instead of an ointment?

Usually the site, and whether you will actually use it. Ointments penetrate better and are more potent for the same steroid, but they are greasy and poorly suited to the face, the scalp, or skin folds. A treatment that gets applied beats a more potent one that doesn't.

I react to every moisturizer I try. Can compounding help?

Often, yes — this is one of the strongest cases for it. If patch testing has identified a specific allergen, the active drug can be compounded into a base that omits it. Bring the patch test results; the specific allergen names are what the pharmacy works from.

Can you copy a brand-name product that costs too much?

Not simply because of price. Section 503A does not permit compounding a drug that is essentially a copy of a commercially available product. If your prescriber determines that a change makes a significant difference for you, that reason goes on the prescription and the analysis is different.

How long until I know whether it is working?

It depends on the condition, and the honest answers are longer than people expect. Acne is usually judged at eight to twelve weeks. Melasma takes months and relapses with sun exposure. A toenail needs nine to twelve months to grow out. Minoxidil needs three to six months.

Will my insurance cover it?

Frequently not. Compounded preparations are often excluded from pharmacy benefits. Ask for the cash price up front.

Why does my compounded cream expire so much sooner than a store-bought one?

Because it carries a beyond-use date set conservatively under USP <795>, rather than an expiration date supported by stability testing on that specific commercial formulation. Water-containing preparations get the shortest dating.

Can I use a compounded steroid cream on my face?

Only if it was prescribed for your face. Facial skin absorbs far more than skin on the trunk or limbs, and potent steroids can cause thinning, telangiectasia, and steroid-induced rosacea there. Do not move a preparation from one body site to another on your own.

Getting started

Start with the prescriber, not the pharmacy. A compounded preparation requires a prescription and, more importantly, a diagnosis — several of the conditions above look alike and are treated in opposite directions, and a topical steroid applied to an undiagnosed fungal infection makes it worse.

Useful things to bring to that appointment: what you have already tried and how your skin responded, any patch testing results, and any product that caused a reaction. If cost or an ingredient sensitivity is the reason a standard product hasn't worked, say so directly — those are the specifics that determine whether compounding is the right answer.

Bayview Pharmacy compounds the preparations described here to a prescriber's order, and our pharmacists are available to talk through strength, vehicle, and excipient questions with you or with your prescriber. More on our dermatology and skin page and in dermatology services.

This article is for general information and is not medical advice. Compounded preparations are not FDA-approved. Discuss your own situation with a licensed healthcare provider.