Found this:
MDMA is a potent releaser and/or reuptake inhibitor of presynaptic serotonin, dopamine and norepinephrine.
Cocaine blocks the dopamine transporter inhibiting reuptake of dopamine from the synaptic cleft into the pre-synaptic axon terminal; the higher dopamine levels in the synaptic cleft increase dopamine receptor activation in the post-synaptic neuron causing euphoria and arousal. Cocaine also blocks the serotonin transporter and norepinephrine transporter, inhibiting reuptake of serotonin and norepinephrine from the synaptic cleft into the pre-synaptic axon terminal and increasing activation of serotonin receptors and norepinephrine receptors in the post-synaptic neuron.
This means there isn’t much left for the mdma to do it’s work?