They died from complications such as pneumonia, brain injury due to low blood glucose and multi-organ failure.
They had taken pills containing overly high levels of a diabetes drug, which lowered their blood sugar levels and caused symptoms such as dizziness, drowsiness and weakness.
So far, four herbal products available here - Power 1 Walnut, fake Cialis, Santi Bovine Penis Erecting Capsule and Zhong Hua Niu Bian - have been found to contain the diabetes drug glibenclamide at levels of up to five times the maximum dose taken by diabetics.
In two of the five cases on Tuesday, the capsules recovered from the families of Mr S. K. Chris and Mr Achmad Yunus Basri were found to contain both glibenclamide and sildenafil.
Sildenafil, an active ingredient for Viagra, should be taken only under a doctor's supervision.
However, for legally manufactured drugs, these two chemicals should not be found in the capsules.