I’m taking inderal propranolol hcl 10mg 3x a day

Patient: I’m taking inderal propranolol hcl 10mg 3x a day and 20mg Tapdin methimazole 2x a day for my hyperthyroidism. However, i mistakenly done a double dose the propranolol within an hour in the morning ( 2pcs 10mg propranolol = 20mg) Is this considered overdose? Should I go to the nearest hospital?

Symptoms: None yet

Doctor: