Which medication may cause insomnia as a side effect?

The correct answer indicates that Bactrim/Septra may cause insomnia as a side effect, which highlights an important consideration in medication management. Bactrim and Septra are sulfonamide antibiotics that are commonly used to treat a variety of bacterial infections. While their primary effects are antibacterial, medications can influence neurotransmitter systems and thus might have effects on sleep patterns in some individuals.

In this case, some patients may experience insomnia as a result of taking Bactrim/Septra for various reasons, including individual side effects or interactions with other medications. It's important to monitor patients for any adverse reactions when they start a new medication, particularly antibiotics, as their effects may not be limited to addressing the infection.

Other medications listed do have distinct properties or common uses that generally would not lead to insomnia. For instance, Ambien is actually a sedative specifically prescribed to help with sleep; Benadryl is known to cause drowsiness; and Allegra is an antihistamine that typically has a non-sedative formulation. Understanding the side effects of medications, including the potential for insomnia, is crucial for proper patient care and management.