agulani

Yes.

Let's say you want to prove the drug is effective. You would go:

H0=The drug isn't effective
H1=The drug is effective

So when you are able to reject H0 you can assure with a XX% confidence that the alternative (H1) is true, i.e. the drug is effective. If you are not able to reject H0 you just can't say anything about whether the drug it's effective or not.

The key is to know that you can prove H0 wrong, but never prove it true. Therefore, the statement you want to prove true must be H1.

In short:
-H1 is always the statement you hope to prove true.
-You can reject H0 => H1 is true // You can't reject H0 => you know nothing.

Just remember that and you'll be fine.