You should not chew the lozenge.
At least not until it gets really small.
You are instructed not to chew the lozenge because doing so will shorten the time it remains in your mouth, and thereby reduce the time available for absorption through the mucous membranes of your mouth.
One of the keys to Banjo’s efficacy is that many of the active ingredients are believed to be absorbed directly into the bloodstream – through the lining of the mouth. If the lozenge spends less time in your mouth, then a smaller percent of active ingredients will be absorbed, resulting in less efficacy.
That’s why, if you’re using Banjo as an herbal pain relieving tea, it’s important that you sip the ‘tea’ – don’t gulp it!