A "standard vial" of RhIg contains 1500 IU (300 µg) of IgG anti-D (one µg = 5 IU). Trace amounts of IgA are also present.
Other red cell antibodies may be present, depending on the IgG antibodies present in the RhIg donors.
Several manufacturers offer mini-doses, which are often 1/6 of the standard vial (i.e., 250 IU or 50 µg).
For exact constituents, each manufacturer's current product insert should be consulted.