It sounds like you're managing a skin reaction with Alastin and Laveta, so let's clarify how to use Laveta safely.

• What is Laveta?
  Laveta contains levocetirizine, an antihistamine commonly used to treat allergic reactions such as skin rashes, itching, and hives. It works by blocking histamine, a chemical involved in allergy symptoms.

• Using Laveta with Alastin and other treatments:
  Generally, Laveta can be taken with or without food and is often well tolerated. Since it is less likely to cause drowsiness, taking it at bedtime is usually safe. However, some people may still feel sleepy, so monitor how you feel after taking it.

• Safety considerations:
  It’s important to follow your doctor’s instructions on dosage and timing, especially when combining Laveta with other treatments like Alastin. Avoid taking more than the prescribed dose.

• Monitoring symptoms:
  Watch for any side effects such as headache, dry mouth, dizziness, or worsening skin symptoms. If you notice any new or worsening reactions, contact your doctor promptly.

• When to seek help:
  If your skin reaction persists beyond a few days, worsens, or you experience severe symptoms, consult your dermatologist or allergist for further evaluation.

Always keep your healthcare provider informed about all medications and treatments you are using to ensure safe and effective care. If you have any doubts or concerns, please reach out to your doctor.To narrow down potential causes, we will need some more information.I understand you're dealing with a skin reaction and want to know if it's safe to take Laveta 5 mg at bedtime, especially since you've used it before. To give you the best advice, I need a bit more information. Could you please provide your age and gender?