Fentanyl Martindale Side Effects

Like all medicines, Fentanyl Injection can cause side effects, although not everybody gets them.
If any of the following symptoms occur, the patient should inform the doctor or nurse immediately. These are symptoms of a serious allergic reaction: sudden wheeziness and tightness of chest; swelling of eyelids, face or lips; skin lumps or hives; skin rash (red spots), itchiness, fever; collapse.
Very common side effects (affect more than 1 in 10 people): muscle stiffness; nausea or vomiting.
Common side effects (affect less than 1 in 10 people): feeling agitated; jerky or uncoordinated movements; drowsiness; dizziness; blurred vision, blind spots or haloes around lights (visual disturbances); a slow or irregular heartbeat; unusually low or high blood pressure; pain along the veins; choking caused by cramping (spasm) of throat muscles; wheezing or difficulty breathing; stopping breathing for a short period of time (if necessary, breathing will be helped by a ventilator); an itchy rash or redness of the skin; confusion.
Uncommon side effects (affect less than 1 in 100 people): euphoria; headache; swelling and clotting along a vein; changes in blood pressure; breathing faster than usual; hiccups; decrease in body temperature or chills; breathing complications.
Other side effects (frequency not known): a serious allergic reaction (see symptoms as previously mentioned); convulsions (fits or seizures); loss of consciousness; muscle twitching; cardiac arrest; slow or shallow breathing; itching of the skin; symptoms of withdrawal syndrome (may manifest by the occurrence of the following side effects: nausea, vomiting, diarrhoea, anxiety, chills, tremor, and sweating); delirium (symptoms may include a combination of agitation, restlessness, disorientation, confusion, fear, hallucinations, sleep disturbance, nightmares).
Other side effects can occur when Fentanyl Injection is used with neuroleptics. These include: chills or shivering; restlessness; hallucinations; unusual movements, including trembling and shaking of the hands and fingers, twisting movements of the body, shuffling walk and stiffness of the arms and legs.
Reporting of side effects: If the patient experiences any side effects, the doctor or pharmacist should be informed. This includes any possible side effects not previously listed.