Is Metronidazole 500 Mg Tablets And Metronidazole 0.75% Gel Safe

is metronidazole 500 mg tablets and metronidazole 0.75% gel safe to takloss e in your third trimister and can this also cause hearing loss cause i have two kids that i had the gel and they both have the same hearing problems and i have another kid that has no hearing issues i never took this with him