What are the side effects of fentanyl buccal tablet?

Seek emergency care if you experience signs of an allergic reaction to fentanyl, which may include: difficulty breathing, hives or rash, swelling of the face, tongue, lips or throat.
Contact your doctor right away or seek emergency treatment if you have: breathing trouble, have drowsiness with slow or shallow breathing, feel very dizzy, feel confused or feel faint. Tell your doctor about any unusual symptoms. These symptoms may mean that you've taken too much of the medication. Possible side effects that are less serious may include sores or pain at the site where you place the tablet in your mouth, dizziness when standing up too fast, vomiting, nausea, sleepiness, constipation and headaches.

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Important: This content reflects information from various individuals and organizations and may offer alternative or opposing points of view. It should not be used for medical advice, diagnosis or treatment. As always, you should consult with your healthcare provider about your specific health needs.