Cyclopentolate ophthalmic relaxes muscles in your eye to dilate (widen) your pupil.

Phenylephrine is a vasoconstrictor that shrinks blood vessels.

Cyclopentolate and phenylephrine ophthalmic (for the eyes) is a combination medicine used to dilate your pupils in preparation for an eye exam.

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  • Cyclomydril
  • Get emergency medical help if you have any of these signs of an allergic reaction: hives; difficult breathing; swelling of your face, lips, tongue, or throat.

    Call your doctor at once if you have:

    blurred vision, tunnel vision, or seeing halos around lights;
    eye pain;
    fast heart rate, severe headache, pounding in your neck or ears, anxiety;
    fever;
    little or no urinating;
    flushing (warmth, redness, or tingly feeling);
    severe constipation; or
    weak or shallow breathing.
    Infants and children may be more likely to have side effects from cyclopentolate and phenylephrine ophthalmic. Tell the doctor if the child has:

    confusion, changes in behavior, hallucinations;
    speech problems, trouble recognizing people;
    restless or excited behavior;
    loss of balance or coordination;
    seizure (convulsions); or
    feeding problems or loss of appetite.
    Common side effects may include:

    dry mouth, nose, or throat;
    decreased sweating; or
    sensitivity to sunlight.
  • Instill one drop in each eye every five to ten minutes. To minimize systemic absorption, apply pressure over the nasolacrimal sac for two to three minutes following instillation. Observe infants closely for at least 30 minutes.