Key takeaways:
Limited distribution drugs (LDDs) are medications that are only available through certain specialty pharmacies. They’re often high-cost medications that require special handling, monitoring, or additional support.
If you’re prescribed an LDD, you may need to use a specific specialty pharmacy instead of your usual pharmacy. You may also need to enroll in a specialty medication hub.
Specialty hubs and pharmacies can help with insurance approval, medication delivery, and treatment support for LDDs. Responding promptly to their calls or messages can help prevent treatment delays.
Filling a prescription is usually as simple as going to your local pharmacy. But some medications, known as limited distribution drugs (LDDs), are only available through certain pharmacies. This means getting your medication may involve a few more steps than you’re used to.
LDDs often require special handling, close monitoring, or additional support during treatment. But what makes a medication an LDD, and what can you expect if you’re prescribed one? Here’s what you need to know.
What are limited distribution drugs?
LDDs are medications that are only available through a select group of pharmacies. They’re typically high-cost medications used to treat complex or rare medical conditions.
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Medication manufacturers often use limited distribution to help ensure the product is handled properly. This is because LDDs often have special storage and handling, administration, or monitoring requirements. The pharmacies that fill these medications typically must agree to follow specific manufacturer guidelines.
Are limited distribution drugs and specialty medications the same thing?
No, LDDs and specialty medications are related, but they aren’t exactly the same thing.
Specialty medications are generally high-cost medications that treat complex, chronic, or rare health conditions. Some specialty medications are LDDs, meaning they’re only available through a few specific pharmacies. But other specialty medications are available through a wider network of specialty pharmacies.
Why can you only get limited distribution drugs filled at specific pharmacies?
LDDs are only dispensed by one or more specific pharmacies, known as a limited distribution network. Pharmaceutical manufacturers use limited distribution networks to help keep a close eye on how their medications are dispensed. This model helps ensure that people get a consistent experience from the pharmacy. It also helps reduce shortages and keep distribution costs down. A smaller pharmacy network can help the manufacturer collect data and feedback from people using the medication.
Services provided from pharmacies that dispense LDDs typically include:
The pharmacy’s clinical staff is highly trained on the medication and the condition it treats.
The pharmacy staff is trained on the steps necessary for insurance approval and other ways to lower medication costs.
The medication storage is strictly regulated, both at the pharmacy and when it’s shipped or handed off to you.
Regular follow-ups ensure the medication is working properly and help manage any side effects or other issues that occur.
What types of medications are limited distribution drugs?
LDDs are typically specialty medications that are considered high risk. This means they may have a greater risk of serious side effects or come with specific storage requirements. Some may require extra training to ensure you can use them safely.
Some LDDs are only available in a healthcare setting. These include some medications that are administered by a healthcare professional.
Some examples of LDDs include:
Jynarque (tolvaptan), which treats a certain type of kidney disease
Certain cancer medications, such as Keytruda (pembrolizumab), Tarceva (erlotinib), and Xtandi (enzalutamide)
Certain multiple sclerosis medications, such as Aubagio (teriflunomide), Kesimpta (ofatumumab), and Plegridy (peginterferon beta-1a)
Certain psoriasis biologics, such as Cosentyx (secukinumab) and Otezla (apremilast)
What should you know if you’re prescribed a limited distribution drug?
You often won’t know that you’re prescribed an LDD until your prescriber or insurance provider tells you.
In most cases, you’ll need to fill the prescription at a certain specialty pharmacy in order to receive it. In most cases, the specialty pharmacy will be selected for you. You may also need to enroll in a specialty medication hub — a free service center that helps coordinate access to LDDs and other specialty medications.
The specialty pharmacy will typically handle your prescription from start to finish. This includes:
Getting the prescription from your healthcare team
Submitting any information needed for insurance approval
Applying any available manufacturer copay savings cards
Handling billing and financial assistance, if needed
Safely getting the medication to you or your prescriber’s office
Training you on how to use the medication properly
Following up with you as to how you’re doing throughout treatment
Be sure to respond to any calls or messages from the specialty medication hub or pharmacy promptly. It often takes several rounds of communication before they’ll have the information they need to get the medication to you.
Frequently asked questions
Yes, Trikafta (elexacaftor / tezacaftor / ivacaftor) is an LDD. It’s a specialty medication used to treat cystic fibrosis. Trikafta is available only through certain specialty pharmacies. Your insurance provider can help you determine which specialty pharmacy you need to use to fill your prescription.
Manufacturers may consider several factors when choosing pharmacies to dispense their medications. These can include:
Accreditation for specialty medication handling and storage
Clinical expertise and years of experience
Patient education and monitoring services provided
Dispensing and inventory data management
Manufacturer and insurance provider relationships
Yes, Trikafta (elexacaftor / tezacaftor / ivacaftor) is an LDD. It’s a specialty medication used to treat cystic fibrosis. Trikafta is available only through certain specialty pharmacies. Your insurance provider can help you determine which specialty pharmacy you need to use to fill your prescription.
Manufacturers may consider several factors when choosing pharmacies to dispense their medications. These can include:
Accreditation for specialty medication handling and storage
Clinical expertise and years of experience
Patient education and monitoring services provided
Dispensing and inventory data management
Manufacturer and insurance provider relationships
The bottom line
Limited distribution drugs (LDDs) are medications that are only available through certain specialty pharmacies (known as a limited distribution network). They’re often high-cost medications that require extra monitoring, special storage or handling, or additional support to use safely. If you’re prescribed an LDD, you may need to use a specific specialty pharmacy instead of your usual local pharmacy.
Getting an LDD may involve some extra steps, but the specialty pharmacy can help guide you through the process. This may include getting insurance approval, arranging medication delivery, and providing support throughout treatment. Responding promptly to calls or messages from the pharmacy or specialty medication hub can help prevent delays in getting your medication.
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References
Anderson, K. E., et al. (2026). Scope and characteristics of patients filling medications through specialty pharmacies by ownership type. Health Affairs Scholar.
ASHP. (2015). ASHP specialty pharmacy resource guide.
Byrnes, M. (2018). The ins and outs of specialty pharmacy. Pharmacy Times.
Florida Blue Cross Blue Shield. (2026). Limited distribution drugs.
IPD Analytics. (2024). Understanding limited distribution networks.
Karas, L., et al. (2018). Limited distribution networks stifle competition in the generic and biosimilar drug industries. The American Journal of Managed Care.
Peter, M. E., et al. (2022). Exploring healthcare providers’ experiences with specialty medication and limited distribution networks. PLoS One.
Vanscoy, G., et al. (2020). The reemergence of specialty pharmacy. The Journal of Managed Care & Specialty Pharmacy.
