Betahistine

• The usual dose of betahistine is half a tablet (8 milligrams) or one tablet (16 milligrams) taken 3 times daily. However, depending on your response. your doctor may tell you to take different doses.
• Always take your betahistine exactly as your doctor has told you. The pharmacy label on your medicine will tell you how much betahistine to take, how often to take it and any special instructions.

• Take your betahistine tablets with a glass of water.
• Take betahistine at the same times each day.
• It is best taken with or after food, to prevent stomach upset.
• Keep taking betahistine every day. It usually takes 1 to 2 weeks before any response to betahistine is noticeable. 
• Missed dose: If you forget to take your dose, take it as soon as you remember that day. But, if it is nearly time for your next dose, just take the next dose at the right time. Do not take double the dose.

Here are some things to know when you're taking betahistine. Other things may be important as well, so ask your healthcare provider what you should know about.

• Limit or avoid drinking alcohol while you are taking betahistine.
• Other medicines: betahistine interacts with some medications including antihistamines which can be bought over the counter. Betahistine may interact with herbal supplements and rongoā Māori, so check with your doctor or pharmacist before starting betahistine and before starting any new products.

Like all medicines betahistine can cause side effects, although not everyone gets them. Often side effects improve as your body gets used to the new medicine.