Pregnancy Safety Information for Phenergan
Safety Classification During Pregnancy
Phenergan (promethazine) is classified as a Category C medication during pregnancy. This means that whilst animal studies have shown some adverse effects, there are limited well-controlled studies in pregnant women. However, extensive real-world use suggests it may be considered when the potential benefits outweigh the risks.
First Trimester Considerations
During the first trimester (weeks 1-12), organ development occurs rapidly. Current evidence suggests Phenergan tablets and elixir may be used cautiously for severe morning sickness when other treatments have failed. EverydayMeds stocks both Phenergan 25mg tablets (56 tablets) and Phenergan Elixir 5mg/5ml oral solution (100ml) for flexible dosing options. Your healthcare provider will determine the most appropriate formulation and strength.
Second and Third Trimester Use
Phenergan is more commonly prescribed during the second and third trimesters for managing pregnancy-related nausea, allergies, or sleep difficulties. The sedating properties can be beneficial for pregnant women experiencing insomnia, though non-pharmacological approaches should be tried first. Regular monitoring ensures both maternal and foetal wellbeing throughout treatment.
Dosage Adjustments for Pregnant Women
Pregnant women typically require lower doses than standard adult recommendations. For morning sickness, doses of 12.5-25mg may be prescribed, often starting with the Phenergan elixir for precise dose titration. The tablet form offers convenient 25mg dosing for established treatment regimens. Your GP may recommend splitting tablets or using the liquid formulation initially.
Breastfeeding Considerations
Small amounts of promethazine pass into breast milk. Whilst generally considered compatible with breastfeeding, it may cause drowsiness in nursing infants. Monitor your baby for unusual sleepiness or feeding difficulties. EverydayMeds' pharmacist consultation service can provide additional guidance on timing feeds around medication administration.
