Side effects are uncommon as it is applied in small amounts to small areas of skin.
Reported side effects include:
Localised irritation: redness, burning or swelling of the skin where the gel has been applied
Rarely systemic side effects can occur (usually if very frequent application to a large area of skin): dizziness, palpitations, headache, drowsiness.
If you experience any of the above side effects, stop using the gel or reduce how much and how often you are applying it.
Very occasional increased blistering of skin has been observed when using Instillagel. If this happens, stop Instillagel immediately, wash off the area and seek medical assessment.