When we drain the spair bath tub it causes a gurgling sound in our master bedroom shower and the toilet leaks at the base. Our house is on a slab. What could be causing this?

Partially clogged vent stack. Best to rod from the roof with a sewer rod long enough to reach roof top to blow the slab plus 20'

Boib's correct,

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When we drain the spair bath tub it causes a gurgling sound in our master bedroom shower

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The sound you hear is the tub attempting to vent, (pulling air), through the shower trap. Snake the lavatory roof vent. Good luck, m Tom