Phentermine FAQs

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Phentermine Dosage & Precautions

What is the difference between phentermine tablets and capsules?

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The most commonly known form of phentermine is the white tablet with blue speckles, although there are also plain white tablets made by certain manufacturers, all of which can be seen here. Adipex-P, the most popular phentermine brand, comes in the form of white tablets with blue speckles, and it is thought that manufacturers such as Actavis Pharmaceuticals and Qualitest Pharmaceuticals copied this widely recognized design for their phentermine tablets to maximize their selling potential, as people often incorrectly believe that the blue speckles are the active phentermine ingredient.

One advantage of tablets is that they can be notched for splitting; many people taking phentermine begin by taking half a pill and working up to a whole pill, or some will take half in the morning and the second half later in the day. This is not possible with capsules as they cannot be broken. Another advantage is that tablets are cheaper to make and so, patients often find that their prescription is cheaper to fill.

However, one disadvantage of tablets is that they can pass through the body without being completely absorbed, meaning that it is possible that some of the phentermine fails to enter your blood stream. Another disadvantage of phentermine tablets is that they are only available in the maximum dosage of 37.5mg. If your doctor feels that a lower dose is more suitable for you then it is likely you will be advised to split your tablet, or that you will be prescribed capsules, as these are available in doses of 15mg, 30mg, and 37.5mg.

Phentermine capsules come in a wide variety of colors, and include the popular phentermine brand Adipex, the FDA-approved phentermine and topiramate combination Qsymia, and various dosages of generic phentermine. Adipex capsules are available in the 37.5mg dosage, as shown here, while generic phentermine capsules are available in either 30mg or 15mg, as shown here. Qsymia is available in four different dosages, ranging from 3.75mg of phentermine and 23mg of topiramate to 15mg of phentermine and 92mg of topiramate, all of which are shown here. Read more about phentermine combinations such as Qsymia here.

One major advantage of capsules is that they have a much better absorption rate than tablets as they begin to dissolve immediately in the stomach and there is little to no chance that any of the contents will fail to be absorbed by the body. Furthermore, unique mixes and ingredients are more achievable with capsules, which is why Qsymia is produced in capsule form. Qsymia provides prolonged appetite suppression and energy boosting effects by combining topiramate with low doses of phentermine, which would be difficult to produce as a tablet.

One disadvantage of capsules are that they are more expensive to produce, therefore a prescription for phentermine capsules can sometimes be more costly for patients. Although capsules cannot be split like tablets can, as they are available with lower dosages of phentermine there is more chance for your doctor to prescribe an appropriate dosage rather than just 37.5mg, and therefore there is less need for patients to have to split their dosage. Capsules are also generally easier to swallow for many patients.