I have ran out of ramipril 10 mg can i take two amlodipine 5 mg instead?

Those 2 medications are of different classes of antihypertensive drugs so the potency in mg is different even same 10 mg strength. Some people, especially African Americans, are more sensitive to Amlodipine than Ramipril. You can do that but monitor BP closely then trying to get the Rx for Ramipril again. We use different class of antihypertensive medication for different objective.