It sounds frustrating to deal with prescription issues, especially after your recovery from RALP. It's not uncommon for patients to encounter challenges with medication prescriptions, particularly when it involves policies from local health authorities or Integrated Care Boards (ICBs).
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Many people have faced similar situations where local policies affect access to medications like Tadalafil. It's good that you're following up with both the hospital and the ICB to clarify the situation and ensure you receive the recommended dosage.
In the meantime, consider discussing your concerns with your surgeon or a urologist at the hospital—they may be able to advocate on your behalf or provide alternative solutions. Keeping a record of your communications can also help in resolving the issue more efficiently. Good luck!