Would I need more than a bottle of Robitussin?

Sorry if im asking a silly question but I read that I need to take 2 tsp 3x a day, 5 days before ovulation. That means, I would need more than one bottle of Robitussin correct?

I just used Guaifenesin tabs twice a day. It was easier and the more active ingrediants something has, its more likely to cause unwanted side effects

I used them twice a day, starting when I started to notice my cm thinning out and becoming more abundant.

I took the mucinex tablets, so I only needed 1 box per cycle

I'm not sure because I never used it but sounds like you got some great answers, thanks!!