My mom is 66 years old, healthy, and active. She began taking Pristiq (50 mg) last week and started having a persistant ringing in her ears. Many years ago, another medication caused this condition and it was discontinued, but now the ringing has returned with the use of Pristiq. She does not know whether to discontinue the medication, as the pharmacist says ringing in the ears is not a side-effect of Pristiq. Can you help clarify whether or not it may be related?