Your donation will make a difference:
Cystic Fibrosis Trust

Please Log in

Log in

Not a registered user? Register with us

This trial has been added to your watchlist.

Do you want to receive email notifications when the trial status changes?

No Yes

Unfollowing a trial will remove it from the watchlist and stop status change email notifications

Are you sure you want to unfollow this trial?

Yes, remove from watchlist

A study of the combined long-term safety of three CFTR modulator medicines in people with cystic fibrosis (VX19 445 115)


Therapeutic category
the type of treatment or therapy being studied. A therapy could range from a medication addressing a particular characteristic of CF to a device or activity e.g. exercise

Restore CFTR Function

Trial status

Closed in follow up

the different stages involved in the development of a new medication. Phase I focuses on initial safety in people. Phase 2 evaluates safety, correct dose and early signs of whether the medication works. Phase 3 is the stage before medication licensing and looks at safety and medication effectiveness. Phase 4 evaluates longer term use of a medication after it has been licensed for use

Phase III

Full title

A Phase 3b study of the long-term safety of a triple combination therapy of VX-445 (elaxacaftor), tezacaftor and ivacaftor in people with cystic fibrosis

In order to take part in this study you will already be taking part in the VX18-445-109 study. VX-445 is a medicine being studied for how well it works and how safe it is in people with cystic fibrosis. Your participation in this study will help us learn more about the safety of taking VX-445 in combination with tezacaftor and ivacaftor for a long time. All three of the medicines are CFTR modulators which means that they help the faulty CFTR protein to function properly. Tezacaftor is already approved for use and is what is known as a corrector. Ivacaftor is also already approved for use and is what is known as a potentiator. VX-445 is a corrector. Everyone in the study will get the study medications. If you meet the rules for being in the study, you will take VX-445, tezacaftor and ivacaftor in the morning (in 2 pills), and ivacaftor in the evening (1 pill). You will be asked to come into clinic around 8 times over up to 52 weeks. During visits, we will measure how the drug is affecting health with bloods and other samples, vital signs and other investigations. You will also receive 7 telephone consultations, each around half an hour, during this period. You do not have to come to clinics for these.

Trial Reference Number


Trial type


the name of the treatment or therapy being researched

CFTR Modulators

Last edited date

10 June 2020

CF sponsor

Vertex Pharmaceuticals Incorporated

CF sponsor type


Who can take part?

Top inclusion criteria
  • 12 Years and older
  • Currently participating in study VX18-445-109
Top exclusion criteria
  • History of intolerance in study VX18-445-109
  • Current participation in an investigational drug trial (other than study VX18-445-109)