Can rogaine (containing 5% minoxidil) be taken as a pill instead of a liquid?

There is a pill version of Minoxidil available- however it's generally used only if there is a significant problem with using it topically. This version generally has more significant side effects so is not as commonly prescribed. 

As I knowledge, there is tablet form of minox, used with other medications to treat high blood pressure ..  but serum form of minoxidil is used to stop hair loss as topical usage . You also may use finasteride pills to stop hair loss .

Minoxidil is available as a pill. There are alot more side effects - some quite significant. If you are going to consider this pill, spend time educating yourself. I don't prescribe it very much nor do many of my North American colleagues.If pills are what you are looking for, you might also consider finasteride. But again, spend the time to review all side effects.