EXHIBIT 12

McKESSON CORPORATION
COMPUTATION OF RATIO OF EARNINGS TO FIXED CHARGES PREVIOUSLY INCLUDED IN THE ANNUAL REPORT ON FORM 10-K FOR THE FISCAL YEAR ENDED MARCH 31, 2006

	Years Ended March 31,
(In millions)	2006			2005			2004			2003			2002
Earnings:
Income (Loss) from continuing operations before income taxes	$	1,171		$	(266	)	$	869		$	812		$	558
Adjustments:
Equity in net income of and dividends from equity investees		(15	)		(4	)		(1	)		(6	)		2
Fixed charges		133			159			158			165			161
Interest Capitalized		(4	)		(6	)		(4	)		(3	)		(2	)
Earnings as adjusted	$	1,285		$	(117	)	$	1,022		$	968		$	719
Fixed charges:
Interest expense (a)	$	94		$	118		$	120		$	128		$	126
Portion of rental expense representative of the interest factor		35			35			34			34			33
Capitalized interest		4			6			4			3			2
Total fixed charges	$	133		$	159		$	158		$	165		$	161
Ratio:
Ratio of earnings to fixed charges		9.7			(b)			6.5			5.9			4.5

(a)	Interest expense includes amortization of debt discounts and deferred loan costs.
(b)	Earnings for the year ended March 31, 2005 were inadequate to cover fixed charges. The coverage deficiency was $276 million for ratio of earnings to fixed charges.