Acne Drugs

Core Concepts

The pilosebaceous unit and the four pillars of acne

Each follicle and its sebaceous gland form a pilosebaceous unit. In acne:

1. Sebum excess: Androgens stimulate sebaceous glands to produce more oil.
2. Follicular hyperkeratinization: Cells lining the follicle shed abnormally and stick together, plugging the pore. A plugged follicle is a comedone — closed (whitehead) or open (blackhead; the dark color is oxidized material, not dirt).
3. **C. acnes overgrowth:** The trapped, oily, oxygen-poor environment favors this normal skin bacterium.
4. Inflammation: Bacterial products and follicle contents trigger inflammation; if the follicle wall ruptures, contents spill into the dermis, producing red papules, pustules, nodules, and cysts — and potential scarring.

Treatment selection follows this quartet: reduce sebum, normalize keratinization, reduce bacteria, and calm inflammation.

Topical retinoids: fixing the clog

Retinoids are vitamin A derivatives. Applied topically (e.g., tretinoin, adapalene, tazarotene), they normalize follicular keratinization — the cells shed properly instead of plugging the pore. They are comedolytic (they clear and prevent comedones) and are considered first-line for most acne, especially comedonal acne. Key nursing-relevant facts:

• They work slowly — visible improvement typically takes weeks to months.
• They commonly cause initial dryness, peeling, and irritation, and they make skin more sun-sensitive.
• They are not antibiotics; resistance is not a concern, which is why they are the backbone of combination therapy.

Benzoyl peroxide: the oxidizer that bacteria can't outsmart

Benzoyl peroxide releases oxygen when it contacts skin, creating an environment C. acnes cannot survive — an oxidizing antimicrobial action. It also has mild keratolytic (peeling) effects. Because its mechanism is physical/chemical, bacteria do not develop resistance to it — which is why it is the recommended partner for topical antibiotics. It can bleach fabric and cause dryness and irritation, so patients need practical teaching (use white towels and pillowcases, expect some stinging).

Keratolytics and other topical agents

Salicylic acid, available over the counter, is a keratolytic that loosens the glue between cells, helping shed the top layer and unclog pores. It is milder and less effective than prescription retinoids but useful for mild, comedonal acne. The pattern for study: mild disease → topical therapy; moderate → combinations; severe → systemic therapy.

Topical and systemic antibiotics

Topical clindamycin and erythromycin reduce C. acnes populations directly at the follicle. They work well but are best used in combination with benzoyl peroxide or a retinoid — an antibiotic used alone invites bacterial resistance and gives slower, less complete results. Systemic antibiotics (tetracycline-class drugs are the classic choice for acne) treat moderate-to-severe inflammatory acne by combining antimicrobial action with anti-inflammatory effects. They require months of adherence, carry photosensitivity and other class-specific considerations, and their use is time-limited to reduce resistance.

Oral retinoids: isotretinoin

Isotretinoin is an oral retinoid reserved for severe, scarring, or treatment-resistant nodular acne. It shrinks sebaceous glands (dramatically reducing sebum), normalizes keratinization, and reduces C. acnes indirectly by removing its food supply — the closest thing acne therapy has to a "reset." It is also the most safety-intensive acne drug:

• It is a known teratogen — it can cause severe fetal harm, so pregnancy must be excluded before starting and prevented throughout treatment and for a time afterward (in the United States, a restricted-distribution program governs its use).
• It requires regular monitoring for other potential effects (e.g., on lipids and liver) per current guidelines.
• It commonly causes dry skin, lips, eyes, and nose — practical side effects that need proactive teaching.

Nurses do not prescribe isotretinoin, but they are often the ones verifying pregnancy-prevention counseling, reminding about monitoring visits, and teaching about side effects — an excellent example of the nurse's role in high-risk therapy.

Hormonal therapies

Because androgens drive sebum production, hormonal approaches are options for some people, particularly those whose acne flares cyclically or resists other treatment. Combined oral contraceptives (estrogen–progestin products) and the androgen-blocking drug spironolactone reduce androgenic stimulation of sebaceous glands. These are mechanism-based choices made by the prescriber based on the person's sex, age, health history, and preferences — a reminder that "one acne treatment" does not exist, and selection is individualized.

Common Confusions