Megaloblastic anaemia may be caused by all of the following except

<p>Phenytoin decreases folate absorption & increases its excretion causing megaloblastic anaemia.</p><p>Methotrexate is folate antagonist </p><p>Pyrimethamine in high doses causes megaloblastic anaemia,especially in those with marginal folate stores.</p><p>Reference :Tripathi essentials of medical pharmacology 7th edition</p>