Using Biddin LS eye drops three times a day as a substitute for Alphagan P twice daily is not advisable without medical guidance, because the total daily dose of brimonidine in Biddin LS (2%) is significantly higher than in Alphagan P (0.3%), which may increase the risk of side effects.

⚠️ Important Considerations

• The concentration and dosing frequency difference means Biddin LS delivers a much higher total daily dose of brimonidine.
• Higher doses can increase side effects like eye irritation, drowsiness, or changes in vision.
• Both medications contain brimonidine but differ in formulation and concentration, so they are not directly interchangeable.

🩺 What You Should Do

• Consult your ophthalmologist before switching to Biddin LS or changing the dose.
• If Alphagan P is unavailable, your doctor can recommend a safe alternative or adjust dosing appropriately.
• Do not self-adjust eye drop strength or frequency to avoid potential harm.

If you want, I can explain more about the differences between these eye drops and their effects.