DEMAZIN COLD RELIEF is an over-the-counter medication used to relieve symptoms of the common cold and flu. The medication contains three active ingredients: paracetamol, phenylephrine, and chlorpheniramine maleate.
Paracetamol is a pain reliever and fever reducer, while phenylephrine is a decongestant that works by narrowing blood vessels in the nasal passages, reducing inflammation and congestion. Chlorpheniramine maleate is an antihistamine that helps to relieve symptoms such as runny nose, sneezing, and itchy eyes.

DEMAZIN COLD RELIEF Colour Free 200ml is a liquid medication that comes with a dosing cup for measuring out the correct dosage. The medication is available in different sizes, and the photo you mentioned showing 100ml may be a smaller size than the 200ml.
It is important to carefully follow the dosage instructions provided on the label and to not exceed the recommended dose. Overdosing on paracetamol can be dangerous and can cause liver damage, so it is important to use this medication with caution and to not use it for longer than recommended.
If you have any underlying health conditions or are taking other medications, it is important to consult with a healthcare professional before taking DEMAZIN COLD RELIEF. Additionally, if you experience any adverse reactions, it is important to seek medical advice.