A number of drug interactions can occur between<unk>  and other drugs, including serotonergic drugs.<unk>  also interacts with drugs which inhibit CYP450 enzymes, like ritonavir (Norvir), particularly CYP2D6 inhibitors. Life-threatening reactions and death have occurred in people who took<unk>  while on ritonavir. Concurrent use of<unk>  high dosages with another serotonergic drug can result in a life-threatening condition called serotonin syndrome. Severe overdose resulting in death has also been reported in people who took<unk>  in combination with certain monoamine oxidase inhibitors, such as phenelzine (Nardil), tranylcypromine (Parnate), or moclobemide (Aurorix, Manerix). Serotonin reuptake inhibitors such as citalopram (Celexa), duloxetine (Cymbalta), fluoxetine (Prozac), and paroxetine (Paxil) have been shown to block most of the subjective effects of<unk> . Norepinephrine reuptake inhibitors such as reboxetine (Edronax) have been found to reduce emotional excitation and feelings of stimulation with<unk>  but don't appear to influence its entactogenic or mood-elevating effects.
MDMA
Phencyclidine
Theobromine
Benzocaine
Heroin
Cocaine
Cocaine 
Amphetamine