 [ Symptoms ] i am iron deficient concerned about the side effects of taking ferro grad c [ Disease ] as per your query missing a single dose of iron supplement is not commonly seen to cause dizziness however low iron levels can itself be a cause of dizziness so in case if you feel dizzy you should get evaluated by your physician continue taking iron supplement as advised by your physician and do not miss the dose for proper effect in case if there is dizziness on taking the iron supplements then it can be due to allergy to the contents but is not commonly seen hope this helps regards