  In muonic atoms the Uehling potential (an effect of a free electronic vacuum
polarization loop) is responsible for the leading contribution to the Lamb
shift causing the splitting of states with Delta n = 0 and Delta l \neq 0. Here
we consider the Lamb shift in the leading nonrelativistic approximation, i.e.,
within an approach based on a certain Schrodinger equation. That is valid for
low and medium $Z$ as long as (Z alpha)^2 >> 1. The result is a function of a
few parameters, including kappa = Z alpha m_ mu/m_e, n and l. We present
various asymptotics and in particular we study a region of validity of
asymptotics with large and small kappa. Special attention is paid to circular
states, which are considered in a limit of n >> 1.
