Alternatives to Benzoyl Peroxide/Erythromycin If You Can't Fill Your Prescription

When You Can't Get Benzoyl Peroxide/Erythromycin, Here Are Your Options

If your pharmacy can't fill your prescription for Benzoyl Peroxide/Erythromycin (Benzamycin), you're not stuck. While it can be frustrating to find this medication, there are several effective alternatives that treat acne in similar ways. Your doctor can help you switch to one that fits your skin type and budget.

In this post, we'll explain what Benzoyl Peroxide/Erythromycin is, how it works, and walk through four alternatives that your prescriber might recommend.

What Is Benzoyl Peroxide/Erythromycin?

Benzoyl Peroxide/Erythromycin is a prescription topical gel sold under the brand name Benzamycin. It contains two active ingredients:

• Erythromycin (3%): A macrolide antibiotic that stops acne-causing bacteria from growing
• Benzoyl Peroxide (5%): An antiseptic that kills bacteria by releasing oxygen, and also helps dry and peel the top layer of skin

Together, these ingredients fight acne from two angles — killing bacteria and clearing clogged pores. The gel is applied twice daily to affected areas and is typically prescribed for mild to moderate acne vulgaris.

How Does Benzoyl Peroxide/Erythromycin Work?

Understanding how this medication works helps explain why certain alternatives are good substitutes.

Erythromycin belongs to the macrolide class of antibiotics. It binds to the 50S ribosomal subunit of bacteria, which blocks their ability to produce proteins. Without protein synthesis, bacteria like Cutibacterium acnes (the main acne-causing bacteria) can't grow or multiply.

Benzoyl Peroxide works differently. It releases active oxygen when applied to the skin, which is toxic to the anaerobic bacteria that thrive in clogged pores. It also has keratolytic properties — meaning it helps shed dead skin cells from the surface, keeping pores clear.

The combination is effective because it attacks bacteria through two different mechanisms, which reduces the risk of antibiotic resistance. This is important to keep in mind when looking at alternatives.

Alternative 1: Clindamycin/Benzoyl Peroxide (BenzaClin, Duac, Onexton)

Clindamycin/Benzoyl Peroxide is the most commonly prescribed alternative to Benzoyl Peroxide/Erythromycin. It's available under several brand names including BenzaClin, Duac, and Onexton, and generic versions are widely available.

Like Benzoyl Peroxide/Erythromycin, this combination pairs an antibiotic with Benzoyl Peroxide. The difference is that Clindamycin replaces Erythromycin. Clindamycin is a lincosamide antibiotic that also inhibits bacterial protein synthesis but works at a different site on the ribosome.

Key facts:

• Available as a topical gel in several strengths
• Applied once or twice daily depending on the formulation
• Generic versions are widely stocked at most pharmacies
• Typical cost: $15–$50 with a discount card for the generic
• Most insurance plans cover it as a preferred generic

This is likely the easiest switch from Benzoyl Peroxide/Erythromycin because it works in almost the same way. Most dermatologists consider it first-line for mild to moderate inflammatory acne.

Alternative 2: Adapalene/Benzoyl Peroxide (Epiduo, Epiduo Forte)

Adapalene/Benzoyl Peroxide takes a different approach. Instead of pairing an antibiotic with Benzoyl Peroxide, it combines a topical retinoid (Adapalene) with Benzoyl Peroxide.

Adapalene works by normalizing skin cell turnover, which prevents pores from clogging in the first place. Combined with the antibacterial and peeling effects of Benzoyl Peroxide, this product treats both the bacterial and comedonal (clogged-pore) components of acne.

Key facts:

• Epiduo contains Adapalene 0.1%/Benzoyl Peroxide 2.5%
• Epiduo Forte contains Adapalene 0.3%/Benzoyl Peroxide 2.5%
• Applied once daily in the evening
• Generic versions are available and cost $30–$70 with a coupon
• Especially good for patients with both inflammatory and comedonal acne

Research published by the American Academy of Family Physicians found that Adapalene/Benzoyl Peroxide is one of the most effective first-line treatments for mild to moderate acne. It may be a better long-term choice than antibiotic combinations because it doesn't contribute to antibiotic resistance.

Alternative 3: Clindamycin Phosphate Topical (Cleocin T, Clindagel)

If your acne is primarily inflammatory (red, swollen bumps rather than blackheads and whiteheads), your doctor might suggest Clindamycin Phosphate alone. This topical antibiotic is available as a gel, lotion, or solution.

Key facts:

• Available in 1% gel, lotion, foam, and solution
• Applied twice daily
• Very affordable — generic costs as little as $10–$25 with a coupon
• Often used in combination with Benzoyl Peroxide wash or cream to reduce resistance risk

The main drawback of using Clindamycin alone is the potential for antibiotic resistance over time. For this reason, dermatologists often recommend pairing it with a separate Benzoyl Peroxide product (like a wash or leave-on treatment) to get the benefits of combination therapy.

Alternative 4: Adapalene (Differin)

Adapalene is a topical retinoid that's now available over-the-counter as Differin Gel 0.1%. You don't even need a prescription for the standard strength.

Key facts:

• OTC Differin Gel 0.1% costs $12–$15 at most pharmacies
• Prescription-strength Adapalene 0.3% is also available
• Applied once daily at bedtime
• Works by regulating skin cell turnover and reducing inflammation
• No antibiotic resistance concerns

Adapalene is a good option if you're looking for something you can start right away without waiting for a prescription. It's especially effective for comedonal acne (blackheads and whiteheads). However, it doesn't contain an antibiotic, so it may be less effective for heavily inflammatory acne without an additional treatment.

How to Choose the Right Alternative

The best alternative depends on your specific type of acne and your treatment history. Here's a quick guide:

• Mostly inflammatory acne (red bumps, pustules): Clindamycin/Benzoyl Peroxide is the closest match
• Mixed acne (inflammation + clogged pores): Adapalene/Benzoyl Peroxide covers both
• Mild acne or maintenance: OTC Adapalene (Differin) is affordable and accessible
• Budget-conscious: Generic Clindamycin Phosphate is the cheapest option at $10–$25

Always talk to your doctor or dermatologist before switching medications. They can recommend the best option based on your skin, medical history, and what your insurance covers.

Still Want Benzoyl Peroxide/Erythromycin?

If you'd prefer to stick with your original prescription, use Medfinder to check which pharmacies near you have it in stock. You might also ask your pharmacy to place a special order or try an independent pharmacy in your area.

For more information about this medication, read our guides on what Benzoyl Peroxide/Erythromycin is and how to save money on it.

Final Thoughts

Not being able to fill your Benzoyl Peroxide/Erythromycin prescription is inconvenient, but it doesn't mean you have to go without treatment. Clindamycin/Benzoyl Peroxide, Adapalene/Benzoyl Peroxide, Clindamycin alone, and OTC Adapalene are all proven acne treatments that your doctor can prescribe (or recommend) as substitutes.

The most important thing is to keep treating your acne consistently. Talk to your prescriber, explore your options, and don't let a stocking issue derail your skincare plan.