What will happen if i take 4 200mg tablets?

Depends: This depends upon the drug in question. You need to indicate that. If this is a prescription item which requires 4 tablets to be take over one day's time, then it is unlikely to cause a problem. But some drugs can cause overdose problems at a 4 times dose. Call your prescribing doctor, or check with a pharmacist or if all else fails, call the local poison control center.