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Anemia can also be a result of getting too little iron or folate

- when there is risk of torsades de pointes, for example in patients with prolonged QT, concomitant administration of other medications that produce torsades de pointes (amiodarone, quinidine, bepridil, IV erythromycin, halofrantine, pentamidine, sparfloxacin, sultopride, vincamine, betrilio, disopyramide, sotalol, etc)

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Hypokalaemia (Low Potassium): In rare cases of severe anaemia corrected rapidly, serum potassium levels can drop rapidly, leading to symptoms such as muscle weakness or an irregular heartbeat

If fatigue continues, a clinician may evaluate anemia, thyroid disease, sleep problems, medication effects, mood concerns, or other causes