Nausea, vomiting, stomach upset, confusion, hallucinations, headaches, drowsiness, urinary retention, constipation, blurred vision, insomnia, rapid heart beats, trouble breathing and respiratory depression.
Tramadol can cause physical and psychological dependence. The human body develops tolerance to the analgesic effects of Tramadol. That means, on regular use of Tramadol, your body gets used to it and you will need more of the drug to induce the same level of pain relief.