To my knowledge, misoprostol is only a prescription drug. However, I live in the USA and am not as familiar with drugs in other countries, so it's possible you might find something outside of the US.
There is no over-the-counter drug to cure heartworms.
And over-the-counter drug that will lengthen bleeding time is aspirin.
If an over the counter drug might affect your ability to drive it will
No.
No, it is not a legal over-the-counter drug or plant anywhere in the world.
yes and an over the counter drug... and an antiacid
an over the counter drug
No, it is a prescription drug.
Absolutely NOTHING! Any over the counter drug will not show up on a standard drug screen.
Sidenafil is not an OTC (Over The Counter) drug, it' s a prescription drug.
Benadryl