It's important to consider a few key points before taking any medication without consulting a physician, especially at the age of 67:

• Health Conditions: Older adults often have multiple health conditions that can affect how medications work. Based on your medication, it seems you may be managing hypertension, which requires careful monitoring.
• Medication Interactions: There might be interactions with other medicines you are already taking, which could affect your treatment or cause adverse effects.
• Side Effects: Some medications can have side effects that are more pronounced in older adults.
• Kidney Function: Your recent kidney function tests are normal, which is reassuring, but this does not eliminate the need for medical supervision when taking or changing medications.

Therefore, it is strongly recommended to consult a specialist doctor, such as a cardiologist or your primary care physician, before starting or changing any medication. They can provide personalized advice based on your health history and current medications to ensure safety and effectiveness. If you experience any urgent symptoms, do not hesitate to seek emergency care.