Cover Page - shares	9 Months Ended
	Sep. 30, 2021	Nov. 05, 2021
Document Information [Line Items]
Document Type	10-Q
Amendment Flag	false
Document Quarterly Report	true
Document Transition Report	false
Entity Registrant Name	FRAZIER LIFESCIENCES ACQUISITION CORPORATION
Entity Central Index Key	0001828326
Document Period End Date	Sep. 30, 2021
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	Q3
Current Fiscal Year End Date	--12-31
Entity Incorporation, State or Country Code	E9
Entity File Number	001-39765
Entity Tax Identification Number	98-1562203
Entity Address, Address Line One	Two Union Square
Entity Address, Address Line Two	601 Union St., Suite 3200
Entity Address, City or Town	Seattle
Entity Address, State or Province	WA
Entity Address, Postal Zip Code	98101
City Area Code	206
Local Phone Number	621-7200
Title of 12(b) Security	Class A ordinary shares, par value $0.0001 per share
Trading Symbol	FLAC
Security Exchange Name	NASDAQ
Entity Current Reporting Status	No
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	true
Entity Ex Transition Period	false
Entity Shell Company	true
Units, each consisting of one Class A ordinary share and one-third of a Warrant to acquire one Class A ordinary share [Member]
Document Information [Line Items]
Title of 12(b) Security	Units, each consisting of one Class A ordinary share and one-third of a Warrant to acquire one Class A ordinary share
Trading Symbol	FLACU
Security Exchange Name	NASDAQ
Warrants, each whole warrant exercisable for one Class A ordinary share at an exercise price of $11.50 [Member]
Document Information [Line Items]
Title of 12(b) Security	Warrants, each whole warrant exercisable for one Class A ordinary share at an exercise price of $11.50
Trading Symbol	FLACW
Security Exchange Name	NASDAQ
Common Class A [Member]
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		14,301,000
Common Class B [Member]
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		3,450,000