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Necon Side Effects

Common Necon Side Effects

Because studies for birth control pills do not usually use a placebo, only vague information is available about possible Necon side effects. In fact, the side effects listed in the prescribing information for Necon are actually the possible side effects of all birth control pills in general. Some of the common bothersome (but not usually dangerous) side effects of birth control pills include but are not limited to:
  • Breakthrough bleeding and spotting between periods (especially for the first few cycles)
  • Headaches (although birth control pills can improve headaches in some women)
  • Nausea and vomiting (this can be improved by taking Necon with food)
  • Breast tenderness and swelling
  • Acne (although birth control pills can also improve acne)
  • Changes in your eyes that make it more difficult to wear contact lenses
  • Bloating
  • Changes in sex drive (typically a decrease in sex drive).

Necon Side Effects to Report

Some side effects with Necon, while occurring infrequently, are potentially serious and should be reported to your healthcare provider right away. Necon 1/50 (but not the other types of Necon) contains a high dose of estrogen. As a result, it may have a higher risk of many of the serious side effects. These include but are not limited to:
    • Vision or speech changes
    • Weakness or numbness in an arm or leg
    • Severe headache
  • Signs of a blood clot in the leg, such as:
    • Pain in the calf
    • Leg cramps
    • Leg or foot swelling
  • Signs of a blood clot in the lung, such as:
    • Shortness of breath
    • Sharp chest pain
    • Coughing up blood
  • Chest pain or heaviness, which may be signs of a heart attack
  • Sudden loss of vision or vision changes, which can be a sign of a blood clot in the eye
  • Signs of liver damage, such as:
    • Yellowing of the whites of the eyes or skin (jaundice)
    • Dark urine
    • Upper-right abdominal (stomach) pain
    • Unexplained rash
    • Hives
    • Itching
    • Unexplained swelling
    • Wheezing
    • Difficulty breathing or swallowing.
Last reviewed by: Kristi Monson, PharmD
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