About 80 students, most of them in Prathom 4 and 5 (Grade 4 and 5), at Wat Tha Phra school in Bangkok Yai district were rushed to three nearby hospitals yesterday after suffering drug intoxication symptoms such as nausea, irregular heartbeat and severe headache. They were found to have swallowed vast quantities of small yellow pills which were identified later as cough relief tablets containing dextromethorphan.