What is a common consequence of over-the-counter medication misuse?

The choice highlighting adverse drug reactions or ineffective treatment accurately reflects the consequences of misusing over-the-counter (OTC) medications. When these medications are not used according to their instructions or recommended guidelines, individuals may experience harmful side effects that they would not have encountered with proper use. Additionally, misuse can lead to ineffective treatment as the wrong dosage, frequency, or combination with other substances can prevent the medication from achieving its intended therapeutic effect. This misuse may also contribute to the development of resistance to certain medications or exacerbate existing health conditions, underscoring the importance of using OTC medications responsibly and under guidance when necessary.

The other options do not align with the realities of medication misuse. For instance, misusing OTC medications does not lead to increased efficacy; in fact, it often has the opposite effect. Similarly, the shelf life of medications does not extend due to misuse, and the need for prescription medications may actually increase rather than decrease when OTC products are improperly used.