Quoting Kandel's Principles of Neural Science, 2013,
Amacrine cells generally receive excitatory signals from bipolar cells at glutamatergic synapses. Some amacrine cells feed back directly to the presynaptic bipolar cell at a reciprocal inhibitory synapse. Some amacrine cells are electrically coupled to others of the same type, forming an electrical network much like that of the horizontal cells.
I tried searching for what a reciprocal inhibitory synapse is but could not find any relevant information.