Which of the following is NOT a cause of hypotension?

Seizures are typically associated with a range of physiological responses, but they are not a direct cause of hypotension. During a seizure, there may be an increase in sympathetic nervous system activity, which can lead to increased heart rate and blood pressure in some cases. While certain types of seizures may lead to postictal states where hypotension could occur due to factors like exhaustion or metabolic changes afterward, these are not direct causes of hypotension during the seizure itself.

In contrast, excessive medications, cardiac dysrhythmias, and allergic reactions can all lead to hypotension more directly. For instance, certain medications, especially antihypertensives and sedatives, can cause a drop in blood pressure. Cardiac dysrhythmias can disrupt the normal pumping action of the heart, thereby affecting blood pressure. Allergic reactions, particularly anaphylaxis, can lead to vasodilation and a significant drop in blood pressure. Thus, among the choices listed, seizures stand out as the option that does not directly cause hypotension.