We consider the T-duality relation between type-0A and -0B theories, and show that this constrains the possible couplings of the tachyon to the Ramond-Ramond (RR) fields. Because of the ``doubling'' of the RR sector in type-0 theories, we are able to introduce a democratic formulation for the type-0 effective actions, in which there is no Chern-Simons term in the effective action. Finally, we discuss how to embed type-II solutions into type-0 theories.