A nurse in a provider's clinic is caring for a client who reports erectile dysfunction and requests a prescription for sildenafil. Which of the following medications currently prescribed for the client is a contraindication to taking sildenafil?

A. Ibuprofen is not recommended for infants younger than 6 months due to the risk of adverse effects, including kidney impairment.

B. Positioning the infant on the abdomen can place pressure on the surgical site and increase the risk of disrupting the incision. Infants should be positioned on the back or side after cleft lip repair.

C. Offering a pacifier is avoided after cleft lip surgery because sucking can place stress on the incision and interfere with healing.

D. Encouraging the parents to rock the infant is appropriate. Gentle comforting measures help soothe the infant without putting pressure on the surgical site and support bonding and emotional comfort.

To calculate the dosage of acetaminophen for the child, first convert the child's weight from pounds to kilograms, knowing that 1 kilogram equals 2.2 pounds.
The child weighs 28 lb, which is approximately 12.7 kg (28 / 2.2 = 12.7).

The prescribed dose is 10 mg/kg, so the child's dose is 127 mg (10 mg/kg 12.7 kg).

Now, using the concentration of the available medication, which is 120 mg/5 mL, you can calculate the volume of medication needed.
For 120 mg of acetaminophen, 5 mL of liquid is required, so for 127 mg, it would be 5 mL (127 mg / 120 mg) = 5.29 mL.
Therefore, the nurse should administer 5.3 mL, rounding to the nearest tenth as instructed.