In case of secondary Carnitine deficiency which is acquired after birth due to external causes, Levocarnitine supplementation will treat the disease , Your child need not take this medicine forever. The medication can be stopped once the blood levels in Carnitine have reached normal levels , In the case of primary Carnitine deficiency which is present from birth, the medicine needs to be taken for a longer time. Your doctor will decide the dose and how long the medication needs to be taken , It is advisable to check for the Carnitine levels in blood and urine regularly while on treatment