Tramadol, including Ultram, responds very well to opioid potentiators used to reduce the amount of medication needed to stop a given level of pain. The most effective appears to be promethazine, which also increases the percentage of the drug changed to stronger active metabolites in the liver as it does with the codeine-based opioid analgesics. Orphenadrine, hydroxyzine, diphenhydramine, chlorpheniramine, carisoprodol and benzodiazepines are commonly-used potentiators for tramadol and other drugs in its range of efficacy. Clonidine can reduce side effects and raise the de facto daily dosage ceiling for tramadol but may also competitively reduce the effects on nerve pain in some patients while having no effect or intensifying it in others.
Carbamazepine and some other agents can affect metabolism in such a way that tramadol single and 24-hour doses may have to be increased by as much as 120 per cent to have the same effect. In some patients, fluoxetine use within 15 days prior to starting tramadol can reduce the effectiveness of tramadol by the same Cytochrome p450-related mechanism that causes fluoxetine to wipe out the usefulness of codeine, dihydrocodeine, and similar drugs for a similar period. Combining fluoxetine and tramadol can increase the potential of some tramadol side effects and if done requires very close medical supervision and often can be made less problematic by the addition of a drug with antiserotonergic effects such as cyproheptadine, various phenothiazines, and anticonvulsants if the continuation of fluoxetine is important.
In addition to its use as the primary centrally-acting analgesic, Ultram can also be used with opioids in the place of adjuvants such as duloxetine to help combat neuropathic pain by broadening the spectrum of actions of the primary opioid; this is very useful with morphine, codeine, and its derivatives, somewhat useful with methadone, piritramide, and levorphanol (possibly because tramadol duplicates much more of the spectrum of effects of these drugs) and should be used only very cautiously with pethidine and most of its derivatives due to additive effects which can have toxic CNS and peripheral effects. Ultram can generally be used alongside many other commonly used adjuvants like orphenadrine and related drugs, although those with impacts on serotonin and norepinephrine levels such as amitryptiline, cyclobenzaprine, duloxetine, and MAO inhibitors should be used alongside tramadol with caution and often with reduced doses of both agents.