Usually on the packaging for the bulb it will state whether it is dimmable.
If in doubt, no is the answer.
However, if you have a ceiling fan with light socket, pop in a compact flouro, they have a habit of randomly flickering when the light isn't switched on, cant recall the exact reason why -something about the fan motor windings, but it will keep your partner up all night freaking out about it!! Cruel, but funny.