• Nausea and stomach upset
• This can be reduced by taking theophylline after food
• Headache
• Feeling tired
• Difficulty in sleeping
• Shakiness or feeling anxious

These symptoms may happen but should get better over time. Check with your doctor if any of these symptoms are serious or do not go away.

In very rare cases, some patients might experience the following:

• Vomiting that does not stop
• Increased, very fast or irregular heartbeat
• Seizures or fits

The symptoms of a drug allergy include one or more of the following:

• Swollen face/eyes/lips/tongue
• Difficulty in breathing
• Itchy skin rashes over your whole body

If you experience any of these symptoms, you should stop your medication and see your healthcare professional immediately.

Inform your healthcare professional if:

• You are allergic to this medication or any of the other ingredients of this medication
• You are pregnant, planning to become pregnant, or breastfeeding
• You are taking any other medications, including supplements, traditional medications and herbal remedies.
• You are a smoker and want to stop smoking.
• You have the following medical conditions:
• Seizures or fits
• Stomach ulcers
• Heart problems with fast or irregular heartbeart
• Thyroid problems
• Liver problems

​Some medications may interact with theophylline and affect the levels of theophylline in your body. Check with your healthcare professional to see if any of your medications interact with theophylline.

You should cut down on your intake of caffeine as it has similar effects to theophylline. Caffeine is commonly found in tea, coffee, chocolates and cola.