Yes, if a patient forgets their morning folic acid tablet, they can take it in the evening the same day.
Folic acid supplementation does not require strict timing during the day—what matters most is consistent daily intake to maintain adequate folate levels for neural tube defect prevention. 1
Practical Guidance for Missed Doses
Same-day catch-up is appropriate: If the morning dose is forgotten, taking it later the same day ensures continuity of supplementation without doubling up the next day 2
Do not double dose: Patients should never take two tablets to "make up" for a missed dose, as doses greater than the recommended amount do not enhance the hematologic effect and most excess is excreted unchanged in urine 2
Maintain daily consistency: The key principle is daily supplementation rather than time-of-day administration, as folic acid needs to be taken continuously for at least 1 month before conception through the first 2-3 months of pregnancy 1
Important Considerations
Adherence challenges are common: Studies show that 56% of women take folic acid only during pregnancy (not preconceptionally as recommended), and 18% take it only intermittently 3. This highlights the importance of flexible, practical advice that supports consistent use rather than rigid timing requirements.
Bioavailability is not time-dependent: Folic acid absorption occurs regardless of the time of day it is taken. The supplement is almost twice as bioavailable as natural food folate and is well-absorbed orally in most patients, even those with malabsorption of food folates 1, 2
Memory aids may help: Given that busy lives, competing priorities, and poor memory are commonly cited reasons for intermittent use 3, patients should be encouraged to:
- Link folic acid intake to a consistent daily routine (morning or evening)
- Use phone reminders or pill organizers
- Keep the supplement visible as a visual cue
Standard dosing applies: For low-risk women, the recommended dose is 0.4-0.8 mg (400-800 μg) daily 1, 4. Taking this dose in the evening instead of morning does not compromise its effectiveness for neural tube defect prevention.