Which of the following medications can cause hypotension?

Hypotension, or low blood pressure, can be a side effect of various medications, including those listed in the options.

Sinemet, which combines levodopa and carbidopa, is commonly used in the management of Parkinson's disease. One of the potential side effects of Sinemet is orthostatic hypotension, a condition where blood pressure falls upon standing, which can lead to symptoms like dizziness and lightheadedness.

Valium, a benzodiazepine, is often prescribed for anxiety, muscle spasms, and seizures. This medication can depress the central nervous system, leading to sedation and, in some cases, can lower blood pressure as a side effect, especially when combined with other CNS depressants.

Tenormin is a beta-blocker used primarily for managing hypertension and certain heart conditions. While it typically lowers blood pressure, it can also lead to significant hypotension in some patients, particularly if the dosage is not appropriate for the individual or if other medications are in use.

Given that each of these medications can contribute to hypotension through different mechanisms, the answer encompasses all of them, recognizing the need for careful monitoring of blood pressure when these medications are being used.