I take Adcal D3 caplets, which you swallow whole. I take two twice a day.
I was initially prescribed chewable ones which were enormous, it was like chewing a piece of chalk and they made me gag. I went back to my doctor and she changed the prescription to the swallowable caplets instead.
If it were me, I wouldn't go buying them, I'd go back to the doctor, explain the problem and get my prescription changed.