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.
1 First-degree heart block occurs when the electrical impulse moves through the AV node more slowly than normal. 2  The heart beat usually has a slower rate but may not cause noticeable symptoms such as light headedness and dizziness and may not require specific treatment. 3  Certain drugs can cause first-degree heart block.