medications used to treat Parkinson’s disease | extrapyramidal effects treatment | OSMOLEX ER

The OSMOLEX ER Difference

  • OSMOLEX ER has a unique drug-delivery system that delivers amantadine throughout the day
  • With OSMOLEX ER, amantadine levels in the blood are higher during waking hours and lower during the night
  • OSMOLEX ER is taken once daily in the morning

OSMOLEX ER is available in multiple dosing options, however, the recommended starting dose is 129 mg. Ask your doctor which dosing option is best for you.

tablets for Parkinson’s disease | extrapyramidal disease drugs | OSMOLEX ER

Not actual tablet size.

  • Take OSMOLEX ER exactly as your doctor tells you
  • Start OSMOLEX ER with 1 tablet in the morning. Your doctor may change your dose if needed
  • Do not stop taking OSMOLEX ER or change your dose before talking with your doctor. Tell your doctor if you have symptoms of withdrawal such as fever, confusion, or severe muscle stiffness
  • OSMOLEX ER may be taken with food or without food
  • Swallow OSMOLEX ER tablets whole. Do not chew, crush, or divide OSMOLEX ER tablets
  • If you miss a dose of OSMOLEX ER, do not make up the missed dose. Take your usual dose of OSMOLEX ER on the next day in the morning
  • If you take too much OSMOLEX ER, call your doctor or go to the nearest hospital emergency room right away
  • OSMOLEX ER should not be used instead of other immediate-release amantadine medicines or other extended-release amantadine medicines
  • The OSMOLEX ER tablet shell does not dissolve completely even after all the drug has been released. The tablet shell may be seen in your stool

Important Safety Information

What is OSMOLEX ER (amantadine) extended release tablets?

OSMOLEX ER is a prescription medicine used to treat adults with:

  • Parkinson’s disease
  • Drug-induced extrapyramidal reactions

It is not known if OSMOLEX ER is safe and effective in children.


  • have kidney problems. Do not take OSMOLEX ER if you have severe kidney problems
  • have unexpected sleepiness, take medicine to help you sleep or that makes you drowsy
  • have mental problems, such as suicidal thoughts, depression, or hallucinations
  • have unusual urges, including gambling, increased sex drive, compulsive eating, or compulsive shopping
  • drink alcoholic beverages
  • are pregnant or plan to become pregnant or are breastfeeding or plan to breastfeed. OSMOLEX ER may harm your unborn baby and can pass into your breastmilk

Tell your doctor about all the medicines you take, including prescription and over-the-counter medicines, vitamins, and herbal supplements. Especially tell your doctor if you take sodium bicarbonate, a medicine that contains sodium bicarbonate, or are planning to receive the flu vaccine.


  • Do not drive, operate heavy machinery, or do other dangerous activities until you know how OSMOLEX ER affects you
  • You should not drink alcohol while taking OSMOLEX ER because it can increase your chances of serious side effects
  • Do not stop taking OSMOLEX ER or change your dose before talking with your doctor. Tell your doctor if you have symptoms of withdrawal such as fever, confusion, or severe muscle stiffness
  • You may receive the flu vaccine (shot or injection) but should not get the live flu vaccine (nasal spray) while taking OSMOLEX ER


OSMOLEX ER may cause serious side effects, including:

  • falling asleep during normal activities, such as driving, talking, or eating, while taking OSMOLEX ER. You may fall asleep without being drowsy or warning. The risk is greater if you take OSMOLEX ER with other medicines that cause drowsiness or drink alcohol. Tell your doctor right away if this happens
  • suicidal thoughts or actions and depression. Tell your doctor right away if you have significant changes in your mood, behaviors, or thoughts, including thoughts about hurting yourself or ending your life
  • hallucinations (seeing, or hearing things that are not real) while you are taking OSMOLEX ER or if you suddenly stop taking OSMOLEX ER
  • feeling dizzy, faint, or light-headed, especially when you stand up too quickly, when you first start OSMOLEX ER, or if your dose has been increased. Tell your doctor if you become dizzy, light-headed, or faint when standing up
  • unusual urges, including gambling, sexual, spending money, and binge eating, and the inability to control these urges. If you notice or your family notices that you are developing any unusual behaviors, talk to your doctor

The most common side effects of OSMOLEX ER include nausea, dizziness, lightheadedness, and trouble sleeping.

These are not all the possible side effects of OSMOLEX ER. Call your doctor for medical advice about side effects.You may report side effects to the FDA. Visit or call at 1-800-FDA-1088.