Assistance Programs | CAYSTON® (aztreonam for inhalation solution)

Trying to understand the complex world of healthcare reimbursement can be overwhelming. That's why Gilead has created the Cayston Access Program® (CAP).

The Cayston Access Program assists you with information about and access to CAYSTON. It is not required that you fill out the Cayston Access Program enrollment forms to receive CAYSTON—your doctor can prescribe CAYSTON for you without going through the Cayston Access Program. However, the Cayston Access Program can provide you with information that may help make it easier for you to understand reimbursement options for CAYSTON.

cayston access program form

To enroll in CAP, an application must be completed with your physician. The preferred method of submission is to fax the full completed form to the Cayston Access Program at 1-877-550-1705. An electronic signature can also be submitted at

Call CAP at 1-877-7CAYSTON 8 AM – 8 PM EST, Monday through Friday with any questions.

Libby, treated with CAYSTON

I worked with the Cayston Access Program when my insurance wasn't covering CAYSTON. They helped me so I did not have to interrupt treatment.”



  • General Information—Our specialists can answer general questions you have about CAYSTON. CAP will also provide a welcome call for new patients to ensure they have received their CAYSTON and answer any questions as they get started.
  • Insurance Verification—Our specialists can verify your health insurance benefits, assess your coverage for CAYSTON, help you through any prior authorization processes, and help clarify any co-payment obligations you may have.
  • Financial Assistance—If you are in financial need, our specialists can check to see if you qualify for our Patient Assistance Program and/or try to find other resources for you.
  • Specialty Pharmacy Referral—The program provides contact information on the specialty pharmacies that stock CAYSTON and the ALTERA® Nebulizer System. Your healthcare provider can send your CAYSTON prescription to the Cayston Access Program. We will work with your selected specialty pharmacy to track your CAYSTON delivery.
  • Claims Appeal Support—If your claim is denied, our specialists can help identify the reason. They can contact your insurance provider to get information about the appeal process and share information about the process.

Financial assistance


CAYSTON Co-pay Coupon Program

People with private insurance pay no more than $10 per fill. There is no monthly limit, but it is capped at 7 fills per calendar year up to a maximum value of $8000 annually.


ALTERA® Co-pay Coupon Program

People on CAYSTON may be eligible to save up to $430 when they pay a $10 co-pay for purchase of an ALTERA Nebulizer System or ALTERA replacement unit. People are eligible to receive up to 2 per year. Contact CAP to use the ALTERA $10 co-pay coupon.


  • Enrolled in the Cayston Access Program
  • Not enrolled in a government healthcare prescription drug program such as Medicare Part D or Medicaid, including the Medicare Part D coverage gap known as the “donut hole”
  • Click here for additional Terms and Conditions

People with government or private insurance needing extra financial support

Independent Third-party Foundation Referrals

For those who do not qualify for the CAYSTON co-pay coupon, the Cayston Access Program (1-877-7CAYSTON) can refer them to available independent third-party foundations such as The HealthWell Foundation, The Assistance Fund, and Patient Services, Inc., including for assistance with the ALTERA Nebulizer.


  • Referral to an independent third-party foundation does not guarantee assistance.
  • Foundations are independent from and unaffiliated with Gilead. Those who apply may need to provide additional information to apply for foundation assistance.

People with no insurance or who have been denied coverage for CAYSTON

The CAYSTON Patient Assistance Program

Provides assistance for those who are uninsured or who have been denied coverage for CAYSTON. Those who qualify may also qualify for assistance for additional or replacement parts for their ALTERA Nebulizer System.


  • Meet income requirements
  • No insurance coverage
  • Insured but denied coverage for CAYSTON