It is always important to discuss medication side effects with a physician who knows you well, especially when there are multiple medications under question. They will be able to give you the best and most comprehensive answers, as they know all the details of your medical history and list of medical conditions.
Berocca is a vitamin supplement containing B vitamins and vitamin C. In the doses that it is usually taken, I am not aware of any significant side effects or drug interactions. The other three medications, however, could definitely interact with each other. For example, Serax (oxazepam) is often used for anxiety
and can be fairly sedating. Atarax (hydroxyzine) is an antihistamine which is also sedating, as is Sinequan (doxepin), an antidepressant. Furthermore, both Atarax and Sinequan have anti cholinergic side effects, which include dry mouth, dizziness
, and drowsiness, which could be more pronounced if taken together.
In conclusion, these four medications should not be taken together except as specifically directed by a physician who knows you well and who is watching dosages and side effects carefully. Please call and make an appointment at your earliest convenience to discuss this issue with your doctor
, and good luck.