You should talk with your healthcare provider prior to taking this medication if you have:
- High blood pressure (hypertension)
- Heart disease
- Difficult passing urine
- An overactive thyroid (hyperthyroidism)
- An enlarged prostate (also known as benign prostatic hyperplasia, or BPH)
- Kidney disease, such as kidney failure (renal failure)
- Any allergies, including allergies to food, dyes, or preservatives.
Also, let your healthcare provider know if you are:
- Pregnant or thinking of becoming pregnant (see Sudafed and Pregnancy)
- Breastfeeding (see Sudafed and Breastfeeding).
Make sure to tell your healthcare provider about any other medications you are taking, including prescription and non-prescription medicines, vitamins, and herbal supplements.
(Click Precautions and Warnings With Pseudoephedrine to learn more, including information on who should not take the drug.)
You do not need a prescription to buy pseudoephedrine in most states. However, any medication containing pseudoephedrine is required to be kept behind the pharmacy counter. You will need to show identification to buy pseudoephedrine, and you will be limited to a certain amount of the medication per month. These measures were put in place to decrease the use of pseudoephedrine to make methamphetamine (see Abuse of Pseudoephedrine for more information).
Some products contain pseudoephedrine in combination with a prescription medication (some examples include Allegra-D® or Clarinex-D®). Of course, a prescription is required for these medications.