Even though ocular medicines containing BAC might cause allergies and dry eye symptoms, BAC is used in approximately 70% of ophthalmic formulations in concentrations that vary between 0.005 and 0.2%. Even though ocular medicines containing BAC might cause allergies and dry eye symptoms, BAC is used in approximately 70% of ophthalmic formulations in concentrations that vary between 0.02 -0.04% . Side effects of this medication include eye pain, change in vision and clarity, redness, and eye irritation, hence it should be used with caution under the supervision of a doctor especially with cases of pregnancy and breastfeeding period . BAC is effective against common ear pathogens like at concentrations between 0.004% and 0.01% . However, high concentrations of BAC can build up in the lipid layers of the tear film and external auditory canal, which can damage them and make it harder for them to heal over time .