The prostaglandin F2-alpha receptor is a member of the Prostanoid Receptor subfamily. Along with various other prostaglandin receptors, it mediates the effects of prostaglandin F(2-alpha) which include modulation of intraocular pressure, corpus luteum regression, and possibly uterine smooth muscle contraction. Alternative mRNA splicing gives rise to two isoforms, FP(A) and FP(B), that differ in their intracellular carboxyl termini and result in different mechanisms for receptor internalization.