Is it safe to take a TCA or a SSNRI for nerve pain if I had palpitations on low doses of first Cymbalta (duloxetine) (60mgOD), then gabapentin (100mgBID)?

Palpitations. although there is some electrophysiologic effect with the above medicines in the absence of a clinical trial tolerability can not be assessed. Following initial dosing to steady-state an ECG may be of value in assessing the potential for arrhythmia by observing intervals such as the QT. Discuss this with the prescribing physician.