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Razene is an anti-allergic used to treat hayfever and other allergic conditions. It is fast-acting, usually within 10-20 minutes after taking it, non-sedating and its effects last for 24 hours, so you only need to take it once a day.
Dosage
Adults and children over 12 years of age: The usual daily dose is one tablet (10mg) as a single dose. In children over 12 years of age, the daily dose of 10mg is given as a single or divided dose, due to the effects of Razene not lasting as long in children. Individuals will vary in their response to medicines and this applies to Razene also:

Some people may only require half the daily dose, i.e. 5mg, e.g. people with kidney problems or those who may feel drowsy if they take the recommended dose of 10mg.

Others may need to take 20mg, e.g. larger people or those who find that 10mg is not enough.
The maximum recommended daily dose is 20mg. Do not exceed this dose unless told to do so by your doctor.

Talk to your doctor or pharmacist to see what dosage is right for you.