Essential tremor is a disorder of the nervous system which causes unintentional shaking or trembling of nearly any part of the body; though the arms, hands, and fingers are most commonly affected. It is not considered to be a dangerous condition and the exact cause of it is unknown, though it has been associated with a chemical imbalance in the brain or a genetic defect.
Certain beta-blocker medications such as propranolol (Inderal) decrease tremors by relaxing nerves in the body and may cause dizziness and tiredness. Anti-seizure medications such as gabapentin (Neurontin) work to block the signals in the brain that can trigger the tremor. For more frequent or persistent tremor, Botox (obotulinumtoxin A) may be prescribed to reduce the shaky movements. These injections can decrease tremors for up to three months and may cause feelings of weakness at the injection site.