The purpose of this study is to evaluate the safety, tolerability, and pharmacokinetics of single dose of VX-581 and multiple ascending doses of VX-581 alone and in combination with tezacaftor (TEZ)/deutivacaftor (D-IVA) or D-IVA for up to ten days.
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Eligibility Criteria
Key Inclusion Criteria:
* Body mass index (BMI) of 18.0 to 32.0 kilogram per meter square (kg/m\^2)
* A total body weight of more than (\>) 50 kg
* Male and Female participants of non-childbearing potential
Key Exclusion Criteria:
* History of febrile illness or other acute illness that has not f…
Key Inclusion Criteria:
* Body mass index (BMI) of 18.0 to 32.0 kilogram per meter square (kg/m\^2)
* A total body weight of more than (\>) 50 kg
* Male and Female participants of non-childbearing potential
Key Exclusion Criteria:
* History of febrile illness or other acute illness that has not fully resolved within 14 days before the first dose of study drug
* Any condition possibly affecting drug absorption
Other protocol defined Inclusion/Exclusion criteria may apply.
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