There is a shortage of this strength of isoniazid tablets until February 2020. Morningside has enough stock of 100mg isoniazid tablets to bridge the gap. These tablets are not score but they are uncoated, and halving them to provide a 50mg dose would be unlicensed. There is relatively little published information on the clinical effects resulting from the administration of split tablets to patients. However in the absence of an alternative licensed product, this is an option in the interim.
Medicines Information Pharmacist, London and South East Regional Medicines Information