From the nervous system: sedation, dizziness; headache; confusion, inhibition, euphoria, weakness, nervousness, depression, agitation, anxiety, drowsiness, slowing of the speed of mental and motor reactions.
From the cardiovascular system: lowering blood pressure; increased blood pressure, tachycardia, bradycardia.
From the respiratory system: hypoventilation, dyspnea, oppression of the respiratory center.
From the gastrointestinal tract: nausea; vomiting, dry mouth, constipation.
From the genitourinary system: delayed urination, decreased erection.
Allergic reactions: skin rash, itching.
Other: sweating, miosis; diplopia, a feeling of heat, chills.
With long-term use of the drug Bupranal®, it is possible to develop addiction (weakening of the analgesic effect) and opioid dependence.