Common side effects include:

• ​Drowsiness
• May affect your ability to drive and use machinery. Make sure your reactions are normal before you drive or do things which require you to be alert.
• Dizziness
• Get up slowly from a sitting or lying down position.
• Dry mouth
• Chew sugar-free gum, suck on sugar-free hard candies or ice chips, sip water regularly
• Dry eyes
• Apply lubricant eye drops if necessary.
• Constipation
• Drink more water (if you do not have any fluid restrictions), eat more high-fibre foods, and exercise regularly
• Overheating of the body
• Monitor your body temperature, especially if you are in hot climates. Drink enough water and avoid staying outdoors during hot weather.

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 not able to empty your bladder (urinary retention) 
• You have delayed or slow emptying of your stomach (gastric retention)
• You have an eye problem called “uncontrolled narrow angle glaucoma”
• You have liver, kidney or heart problems
• You have dementia and are taking medications called cholinesterase inhibitors such as Galantamine, Donepezil, Rivastigmine as these combinations may affect the condition.

• ​Avoid taking grapefruit,or grapefruit juice as they may interact with your medication and increase the risk of side-effects.
• Avoid drinking alcohol as it may increase the risk of dizziness, light-headedness or drowsiness.
• Inform your healthcare professional if you are taking or intend to take any other medication, supplements, traditional medications or herbal remedies.