What are the possible side effects of Escitalopram? Headache, nausea, diarrhea, dry mouth, increased sweating, feeling nervous, restless, fatigue, or having trouble sleeping (insomnia). These will often improve over the first week or two as you continue to take the medication.

Why does Lexapro cause headaches?

Lexapro may cause low salt levels in your body. This may be more likely to occur in seniors, people who take water pills, or people who are dehydrated. This side effect may cause: headache.

Can Lexapro cause severe headaches?

Common side effects of Lexapro include: diarrhea, drowsiness, ejaculatory disorder, headache, insomnia, nausea, and delayed ejaculation. Other side effects include: anorgasmia, constipation, dizziness, dyspepsia, fatigue, decreased libido, diaphoresis, and xerostomia.