Hi, Doxylamine Succinate is an antihistamine medication that is primarily used as a sleep aid. While it can be effective in helping people fall asleep, like any medication, it can also have side effects. Some of the most common side effects of Doxylamine Succinate 25mg include: - Drowsiness: This is the most common side effect of the medication and may persist into the next day. - Dry mouth, nose, and throat: This is another common side effect of antihistamines, and it can be relieved by drinking water or using a humidifier. - Blurred vision: This is a less common side effect, and it can be temporary or permanent. - Dizziness: This can occur when standing up too quickly or after prolonged use of the medication. - Difficulty urinating: This is a less common side effect, but it can occur in people with prostate enlargement or urinary retention. - Confusion: This is more common in older adults or those with underlying medical conditions. - Heart palpitations: This is a rare side effect that can be serious, and it should be reported to a healthcare provider immediately. It is worth noting that some people may experience paradoxical reactions to Doxylamine Succinate, which means that the medication may have the opposite effect and cause agitation, restlessness, or anxiety. In your case, the visions and nightmares you are experiencing may be related to the medication, as it is known to cause vivid dreams and hallucinations in some people. Discuss these side effects with your healthcare provider and consider alternative sleep aids or a lower dose of the medication. Additionally, addressing the underlying cause of your sleep problems may help alleviate the need for medication altogether. Take care. Hope I have answered your question. Let me know if I can assist you further. Regards, Dr. Priyanka, General & Family Physician