Memory loss is very occasionally a side effect of antidepressants. There are no controlled trials that prove that to be the case. Usually, what I like to do in those situations is a thorough assessment of diet and nutrition, as well as thyroid function. It takes several weeks. Watch out for side effects such as palpitations or easy bruising.
Antidepressants have beneficial effects and side effects.
The beneficial effects include improved energy, mood, and ability to experience pleasure. Side effects can be numerous, but most commonly include weight gain, sexual dysfunction, loss of energy, and upset stomach, but it depends on which medication is used. There are many antidepressants that seem to be safe for the breastfeeding mom. Antidepressants should always be used in the context of a comprehensive approach, which should include dealing with biological, psychological, social and spiritual factors. It is not always the case that all of those areas require attention, but they should be assessed.