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When starting this medication, you might experience mild side effects such as headaches, drowsiness, tiredness, weakness, blurred vision, nausea, vomiting, diarrhea, or constipation. These are generally temporary as your body adjusts. If they persist or worsen, it is important to inform your healthcare provider. You may also feel lightheaded or dizzy, particularly when standing up quickly, especially during the initial phase of treatment. To minimize this, rise slowly from sitting or lying positions. If dizziness occurs, sitting or lying down can help, and your dosage might need adjusting.

Be vigilant for more serious side effects and contact your healthcare provider immediately if you notice a pounding heartbeat, fainting, frequent urination, changes in mood or mental state, or swelling in the feet or ankles. Men should be aware that a rare but serious side effect is a painful or prolonged erection lasting four or more hours, which requires urgent medical attention to prevent long-term issues.

Though a severe allergic reaction to this medication is uncommon, seek emergency assistance immediately if you experience symptoms such as a rash, itching or swelling (especially of the face, tongue, or throat), severe dizziness, or difficulty breathing. Always report any other unexpected effects to your healthcare provider for further advice.

Certain medications may interact with this drug. These include other alpha blockers like Doxazosin and Terazosin. Medications for erectile dysfunction or pulmonary hypertension, such as Sildenafil and Tadalafil, can also interact. It’s important to inform your doctor or pharmacist if you’re using products that cause drowsiness. This includes opioid pain relievers like codeine and hydrocodone, alcohol, marijuana, sleep or anxiety medications like Alprazolam, Lorazepam, and Zolpidem, muscle relaxants like Carisoprodol and Cyclobenzaprine, and antihistamines like Cetirizine and diphenhydramine.

Review the labels of all your medications, including those for allergies or colds, as they may contain ingredients that cause drowsiness. Consult your pharmacist about the safe use of these products. Additionally, some products might increase your heart rate or blood pressure. Inform your pharmacist about the products you take and seek advice on their safe use, particularly with cough-and-cold remedies, diet aids, or NSAIDs like Ibuprofen and Naproxen.

This medication can affect certain lab tests, such as those screening for pheochromocytoma, potentially leading to inaccurate results. Ensure that lab staff and all your healthcare providers are aware that you are using this medication.