I.- The maximum value of the period referred to in the second paragraph of II of article L. 5121-12-1 is set at twelve months from the date on which the authorisation referred to in this article is granted.
By way of derogation from the previous paragraph, when the indication for which authorisation is sought is a rare disease, the maximum value of the period is increased to eighteen months from the date on which the authorisation is granted.
II.- By way of derogation from I, at the reasoned request of the holder of the exploitation rights for a medicinal product which is the subject of an authorisation referred to in the second paragraph of II of article L. 5121-12-1 or his representative, the maximum value of the period is increased to eighteen months from the date on which the authorisation is granted. By way of derogation from I, at the reasoned request of the holder of the exploitation rights for a medicinal product which is the subject of an authorisation referred to in the second paragraph of II of Article L. 5121-12-1 or of his authorised representative, the period referred to in I may be extended by successive extensions of a maximum of six months, by decision of the Director General of the Agence nationale de sécurité du médicament et des produits de santé, depending on the state of human research in progress in the indication in question. The Director General of the Agency informs the Ministers of each extension granted.
III – The maximum value of the period mentioned in 1° of VIII of Article L. 5121-12-1 is set at twelve months from the expiry of the period mentioned in the second paragraph of II of the same article when no application for early access authorisation under Article L. 5121-12 has been submitted or from the date of the decision to refuse early access authorisation by the Haute Autorité de santé when such an application has been submitted.