Here is how the poem is introduced in the Folger text:
Never trifle with a Disease. For the Better.
MS Folger p 286 (not crossed out):
Never trifle with a Disease
Regarding lesse the patient then the fees
With uselesse Druggs of ling'ring Ill attack
And keep till 'twas too late the known specifick back
Att verge of Death promise a longer space
And bar the Souls Phisitian Time and place
Then lett not Him or others (next him) fam'd
Believe my Verse att the Profession aim'd
But whilest they reap th'applause they have deserv'd
Smile at th'exposing Quacks who shou'd be lash'd or starv'd.
A Doctor, to no Greek or Latin bred . . .