Unexpected Side Effects of Common Medications You Should Discuss With Your Doctor

15. Mood Stabilizers and Hair Loss: The Unspoken Effect

Medications like lithium and valproate, commonly prescribed for bipolar disorder, are known to stabilize mood—but they may also thin your hair. This side effect can be emotionally distressing, yet it’s rarely discussed upfront. While not everyone is affected, those who are may benefit from dose adjustments, supplemental treatments (like biotin), or switching medications. If you notice excessive shedding, don’t ignore it—it’s not vanity, it’s physiology. A quick conversation with your doctor can lead to gentler alternatives without compromising mental health.

16. Allergy Meds and Urinary Retention: A Tense Situation

Some antihistamines, especially older-generation types, can trigger urinary retention—especially in men with enlarged prostates. The medication’s anticholinergic properties relax smooth muscles, but they also tighten the valve at the bladder neck, making urination difficult. This side effect can escalate quickly from discomfort to a medical emergency. If you notice trouble peeing after starting an allergy med, speak up fast. Your doctor may switch you to a safer alternative or explore non-medicated options for allergy relief.