Do antidepressants cause restless legs syndrome?

Meds can trigger RLS. What "causes" RLS is uncertain. It may be related to genetics, deficiency of iron in the brain, hormonal changes, pregnancy, parkinson's disease. Medications like antidepressants, antipsychotics, cold and allergy medications can trigger or aggravate rls. Treatment with medication can help diminish symptoms.
YES. If somebody has a mild RLS antidepressants like ssri Prozac zoloft (sertraline) Celexa etc. Can make it worse to the level that patient feels symptoms. It can be significant in fact.
Possibly. Could help. Ssris, if stopped abruptly can cause shock like symptoms which could mimic restless legs. Buproprion is an antidepressant which effects brain Dopamine and which may help rls. For RLS caused by nightmares, i often prescribe low dose nortriptyline to lessen the vivid dreams.