Pharmacy have given me a lower dose. What to do?

[panic_down_under]

Does anyone know how I can use my 20mg capsules to still get a 30mg dose? Or will taking 20mg for a few days have a negative impact?

You could dissolve 2 capsules in 100ml of water, or a fruit juice (but not grapefruit juice), stir and drink 3/4 of it, i.e. 75ml.

However, fluoxetine has a very long half-life, about 6 days for it and up to 16 days for its metabolite which does most of the work so blood plasma levels won't drop much if you only took 20mg for 2-3 days.