What will happen if a person takes an overdose of crocin?

It is not clear from your communication the period during which 28 Crocin tablets are taken. The normal adult dose is one tablet every 4 hours though upto 8 tablets can be taken daily without much problem. Thus consumption of 28 tablets over 3-4 days is safe. Overdose at a time can lead to liver damage. The patient needs immediate treatment in the emergency unit of a hospital.