Nardil's withdrawal period can take many months, with the dose gradually reduced every two to three weeks. Depending on how long the patient has been taking Nardil, doctors may decide to extend the withdrawal period to a year or more before discontinuing medication completely. When reducing or withdrawing Nardil, it is important to reduce the dose slowly so as not to experience any adverse effects. Nardil comes in several different doses, depending on how much control you want over your seizures. There are low, medium and high doses available for purchase without a prescription. It is important to start at the lowest dose of Nardil and increase it only if necessary. If you overdose on Nardil, it could cause serious problems with thinking and reasoning, muscle weakness, confusion, loss of consciousness and even death. The best way to avoid an overdose is by reading all labels carefully and keeping track of what you are taking. If you feel like you have taken too much of the drug, seek medical help immediately. Nardil may cause some people who take it daily for several years to develop a resistance to its effects. This means that the medication no longer controls their seizures. In such cases, the person needs to replace Nardil with another medication. Most often, this replacement involves using two drugs at once. One drug reduces the amount of neurotransmitters in the brain while another increases them.