Table 9.19.1.

ABBREVIATIONS USED IN THIS UNIT

a	dose of drug A
A	dose of drug A that gives a specified effect
A50	dose of drug A that gives half of its maximum effect
Aeq(b)	drug A equivalent of dose (b) of drug B
Ai	most general designation for dose of drug A that gives effect level i
b	dose of drug B
B	dose of drug B that gives a specified effect
B50	dose of drug B that gives half of its maximum effect
Beq(a)	drug B equivalent of dose (a) of drug A
Bi	most general designation for dose of drug B that gives effect level i
C	potency constant in common dose response equation
D	dose
D50	Dose of a drug that gives half its maximum response
DRC	Dose-response curve
E	Effect
ED50	Dose that is effective in 50% of subjects
Emax	Maximum effect of a drug
f(a)	g − 1 + gA/a, a simplifying term
Fa	fractional effect due to dose a of drug A
Fb	fractional effect due to dose b of drug B
Fab	fractional effect due to combination (a,b) dose
g	ratio Emax(b)/Emax(a)
p	exponent (on dose) in dose-response equation
q	exponent (on dose) in dose-response equation
pA	proportion of the quantity (total dose) that is drug A in a combination
pB	proportion of the quantity (total dose) that is drug B in a combination
Var	variance
Zadd	Total drug quantity in an additive combination