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.
In addition to harm to the heart from heart disease or hypertension, medications and other elements can cause paroxysmal AFib, including: 1  binge drinking (4 to 5 beverages within 2 hours) 2  stimulant medications and drugs (ex. methylphenidate, pseudoephridrine, drug) 3  nicotine. 4  caffeine. 5  low potassium (electrolyte imbalance)