The bloodshot appearance is due to the irritation and dilation of the surface blood vessel in the eye. Other symptoms can accompany the red appearance, like itching, soreness, discharge and even blurred vision. These symptoms could indicate a more serious problem.
The list of possible medications or substances mentioned in sources as possibe causes of Heart block includes: 1  Beta-adrenergic blockers. 2  Digitalis. 3  Flecainide. Flecatab. 4  Flumadine. Quinidine. 5  Rimantidine. Tambocor.
For some people, these medications can decrease stress symptoms. Beta-blockers such as Inderal (propranolol) and Tenormin (atenolol) block the action of the neurotransmitter and hormone norepinepherine in the arteries and the heart muscle, causing arteries to widen, slowing the action of the heart, and decreasing the force of contraction.