Magnetic monopole Lagrangian and Hamiltonian

Question

How do I find an equation analogous to \begin{equation} \mathcal{L}(q,\dot q)=\frac12 m \dot q ^2-q\phi+q\vec{\dot q}\cdot \vec A\quad\quad \text{where}\quad \vec B =\vec\nabla\times\vec A, \quad \vec E=-\vec\nabla\phi-\partial_t\vec A \end{equation} for magnetic monopole instead of the electric point charge coupling to the $A$-field?