VA Practitioner (1987): one drop in both eyes twice daily Bucci (Glaucoma: Decision Making in Therapy, 1996): 20 were randomly assigned to placebo one drop in both eyes twice a day and 17 were randomly assigned to 0.5% timolol one drop in both eyes twice a day Mittleider-Heil and Skorin (Review of Optometry, 2006):
The Daily Review: Federal court dismisses ‘election integrity’ group’s lawsuit over Pa. election rolls
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daily (adj.) Old English dæglic (see day). This form is known from compounds: twadæglic “happening once in two days,” þreodæglic “happening once in three days;” the more usual Old English word was dæghwamlic, also dægehwelc. Cognate with German täglich.
Why “daily” and not “dayly”? - English Language & Usage Stack ...
Twice-daily is probably the best choice since it is unambiguous and commonly used. Using either bidaily or bi-daily risks the reader getting muddled between "twice a day" and "every other day".