Caffeine - oral [cns stimulant]

Patient Medicine Information
Why do I need this medicine?
Caffeine is used for the relief of temporary tiredness. It helps restore wakefulness or mental alertness.

This medicine may be used to treat other conditions as decided by your doctor.
How do I take this medicine?
Take Caffeine exactly as directed by your doctor or according to the instructions on the label. Do not take more or less than instructed by your doctor.

You may take this medicine with or without food. Try to take it at the same time each day.

You may gradually stop taking this medicine when you feel better or when you don’t feel any tiredness or drowsiness.
What should I do if I have forgotten to take this medicine?
Take the missed dose as soon as you remember. If it is almost time for your next dose, skip the missed dose and return to your normal dosing schedule.

DO NOT double a dose under any circumstances.
When should I not use this medicine?
Alert your doctor if you have the following conditions:
  • current or history of heart rhythm disorder
  • anxiety disorder (mood disorder)
as Caffeine may not be suitable for you.

Do not take this medicine with other medicines that belong to a class known as xanthines, such as theophylline (asthma medicine).
What should I take note of while taking this medicine?
Inform your doctor if you have the following conditions:
  • current or history of seizure disorder
  • history of ulcer in the stomach, bowel, or oesophagus
  • history of GERD or gastroesophageal reflux disease (burning pain in your chest in which food or acid from your stomach backs up into your mouth, leaving a sour or bitter taste)
  • high blood pressure
  • other heart diseases
  • recovering from long-term alcoholism
  • kidney disease
  • liver disease
Let your doctor know if you are pregnant or breastfeeding.

Be sure to check with your doctor or pharmacist before giving Caffeine to a child. Children may be more sensitive to the side effects.

If you are sensitive to Caffeine or you are not used to taking it, you may be more likely to experience side effects of this medicine.
What side effects could I experience?
Caffeine may cause any of the following side effects: headache, stomach problems, increased need to urinate, ringing in the ears, nervousness, anxiety, irritability, difficulty sleeping, involuntary shaking of the hands or legs, rapid breathing, and changes in heartbeat.

Inform your doctor if any of these side effects do not go away or are severe, or if you experience other side effects.
Can I take this with other medicines?
Do not take Caffeine with other medicines that belong to a class of drugs known as xanthines, such as theophylline (asthma medicine).

Inform your doctor and pharmacist if you are taking or using any of these medicines:
  • medicines for high blood pressure e.g. metoprolol, atenolol
  • medicines to treat depression known as a monoamine oxidase inhibitor (MAOI) e.g. isocarboxazid, phenelzine, tranylcypromine
  • medicines for mood disorders e.g. lithium carbonate, clozapine
  • medicines used in hospital tests for heart conditions e.g. adenosine, dipyridamole
  • medicines for nasal congestion e.g. ephedrine, phenylpropanolamine
  • methoxsalen (medicine used to treat a skin condition known as psoriasis)
  • phenytoin (medicine for fits or seizure)
  • disulfiram (medicine used as an aid in the management of alcohol dependence)
This list does not include all medicines that may interact with Caffeine.

Always notify your doctor and pharmacist if you are taking any other medicines, including herbal tonics such as traditional Chinese medicines, supplements and medicines that you buy without a prescription.
What special dietary instructions should I follow?
Avoid alcohol.

Try to limit your intake of caffeine-containing beverages such as coffee, tea and certain soft drinks. This is because these beverages may increase some of the side effects of this medicine.
How should I store this medicine?
Store in a cool, dry place away from the reach of children.

Medicines must not be used past the expiry date.
This information is independently developed by MIMS based on caffeine - oral [cns stimulant] and is provided for your reference only. It is not a replacement for and should only be used in conjunction with full consultation with a licensed healthcare professional, the information provided by your pharmacist and/or the manufacturer of the medication. It may not contain all the available information you require and cannot substitute professional medical care, nor does it take into account all individual circumstances. Although great effort has been made to ensure content accuracy, we shall not be held responsible or liable for any claims or damages arising from the use or misuse of the information contained herein, its contents or omissions, or otherwise. Copyright © 2021 MIMS. All rights reserved. Powered by
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