A compounding pharmacy is a facility where a licensed pharmacist combines, mixes, or alters ingredients to create a custom medication.

Compounding pharmacies are particularly useful when a standard, mass-produced medication isn’t available or doesn’t meet your unique medical needs, whether that’s a specific strength, form, or an ingredient you need removed.

In some cases, compounding pharmacies may also use active ingredients not found in commercially approved medications, which are sourced and prepared specifically for compounded formulas.

The custom medications you get at a compounding pharmacy are not the same as generic drugs. Generic drugs are approved by the Food and Drug Administration (FDA) to be therapeutically equivalent to brand-name medications.

In contrast, compounded drugs are not FDA-approved or regulated, meaning the FDA doesn’t verify their safety, effectiveness, or manufacturing quality.

Keep reading to learn more about compounding pharmacies, including tips for choosing a reputable one.

To find a trustworthy compounding pharmacy, it helps to keep a few tips in mind.

Signs of a reputable pharmacy

  • requires a valid prescription
  • has a state license and accreditation by a reputable organization
  • offers continued support from a licensed pharmacist for counseling, dosage instructions, and dietary support
  • sources active ingredients strictly from FDA-registered facilities

Red flags to avoid

  • does not ask about your complete medical history
  • lacks verifiable credentials and third-party safety testing
  • sells compounded versions of unapproved drugs, like the “GLP-3” retatrutide
  • relies on heavy marketing, aggressive sales tactics, or promises guaranteed results

Compounded drugs are an option for people whose unique health needs can’t be met by standard medications.

Commonly compounded medications include:

Doctors might prescribe a compounded drug in the following situations:

  • if you can’t swallow a pill and need a liquid form
  • if you have a severe allergy to a specific dye or preservative
  • during an FDA drug shortage, such as the previous GLP-1 shortage

Because compounded medications are not FDA-regulated, their quality and safety can vary significantly across pharmacies and batch numbers.

Important: If a compounded drug has too much or too little active ingredient, it can cause serious side effects or fail to treat your condition.

Buying compounded medications online requires extra caution. Purchasing medications from unregulated or unlicensed online sources can increase the risk of receiving low quality, ineffective, or contaminated medication.

Before using an online service, check that it works with licensed pharmacies that clearly state where and how your medication is compounded. Talk with a healthcare professional about your specific circumstances before taking any medication or using an online pharmacy.

If you and your doctor decide a custom medication is right for you, take these practical steps to vet a compounding pharmacy before filling your prescription:

  • Verify active state licenses: Check with your state board of pharmacy to confirm the pharmacy holds an active license in good standing.
  • Ask about voluntary accreditation: Find out if the facility is accredited by an independent quality organization, such as the Pharmacy Compounding Accreditation Board (PCAB).
  • Inquire about ingredient sourcing and testing: Ask the pharmacist where they source their raw ingredients and whether they perform independent lab testing for drug purity and strength.

Disclaimer: While Healthline strives for factual, comprehensive, and current information, this article is not a substitute for a licensed healthcare professional’s expertise. Always consult a doctor before taking or discontinuing any medication. Drug information is subject to change and may not cover all uses, directions, precautions, warnings, interactions, reactions, or adverse effects. The lack of a warning does not guarantee a drug’s safety, effectiveness, or appropriateness for all patients or specific uses. Learn more about our approach to content integrity.