General anesthesia and SSRI’s: Side effects can be seen with these products in combination. The problems occur within 24 hours after the anesthesia. Serotonin syndrome is common and serious side effect that can occur after surgery for a patient that has been on therapy with an SSRI. For example, studies have shown that a patient taking Prozac that then receives Fentanyl for surgery, the incidence of serotonin syndrome increases drastically and the patient should be watched for 24 hours after surgery and/or tapered off of their SSRI prior to surgery.
Local anesthetics and SSRI’s: Side effects can be seen in combo with these products. SSRI’s will actually allow a greater blood supply throughout your body. When giving a topical agent like lidocaine to a patient on SSRI therapy, the lidocaine will have a more enhanced effect, and if used in great surplus, could get into the patient’s blood supply and cause toxicity, which could lead to heart problems like tachycardia (increased heart rate). Once the toxicity has caused an excitable state in the body, it will then cause respiratory and cardiac depression by blocking inhibitory and excitatory pathways.
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