Iron supplements are frequently used to prevent and treat iron-deficiency anemia, notes WebMD. Sometimes they are used to treat depression, fatigue or Crohn's disease. Although iron supplements are generally safe when taken as recommended by a physician, they are not for everyone. Patients with stomach ulcers or ulcerative colitis may find that iron supplements make their symptoms worse. Those who have hemoglobin diseases such as thalassemia should not take iron unless directed to do so by a physician, since iron supplements can lead to iron overload in these patients. The usual dose for treating iron deficiency is 50 to 100 milligrams of iron three times per day. Patients should not exceed this dose unless instructed to do so by a doctor. Pregnant or breastfeeding women who have an iron deficiency should not take more than 45 milligrams of elemental iron per day, as higher doses are likely unsafe. Although controversial, some studies show that high iron intake may be a contributing factor in heart disease.
This drug has lesser affinity for isoenzyme PDE6, an enzyme found in the retina. This lower selectivity is thought to be the basis for abnormalities related to color vision observed with higher doses or plasma levels.
Nonarteritic anterior ischemic optic neuropathy developed in one eye within minutes to hours after ingestion of sildenafil. Four of the five patients had no vascular risk factors for ischemic optic neuropathy.
-Abnormal Vision: Mild to moderate and transient, predominantly color tinge to vision, but also increased sensitivity to light, or blurred vision.
-Visual color distortions: Chloropsia, chromatopsia, cyanopsia, erythropsia and xanthopsia
-Lacrimation disorders: Dry eye, lacrimal disorder and lacrimation increased [ Ref ]