<unk>  may increase the plasma-level of concomitantly given lithium. In order to avoid lithium intoxication, lithium plasma levels should be monitored closely. If<unk>  is given concomitantly with opioids, the opioid dose should be reduced (by approx. 50%), because<unk>  amplifies the therapeutic actions and side effects of opioids considerably. Avoid the concomitant use of<unk>  and tramadol (Ultram). Seizures may be encountered with this combination. Consider additive sedative effects and confusional states to emerge, if<unk>  is given with benzodiazepines or barbiturates. Choose particular low doses of these drugs. Exert particular caution in combining<unk>  with other anticholinergic drugs (tricyclic antidepressants and antiparkinsonian agents): Particularly the elderly may develop delirium, high fever, severe obstipation, even ileus and glaucoma .
Chlorprothixene
Mephentermine
Triflupromazine
Alosetron
Etilamfetamine
Acetryptine
Levomepromazine
Beclamide