April 30, 2017
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(acyclovir) Buccal Tablets

What is SITAVIG?

  • SITAVIG is a prescription medicine used to treat cold sores (herpes labialis) in adults with normal immune systems.
  • It is not known if SITAVIG is safe and effective in children.

Who should not use SITAVIG?

Do not use SITAVIG if you are allergic to:

  • acyclovir or any of the ingredients in SITAVIG. See the end of this leaflet for a complete list of ingredients in SITAVIG.
  • milk protein concentrate

Before using SITAVIG, tell your healthcare provider about all of your medical conditions, including if you:

  • are pregnant or plan to become pregnant. It is not known if SITAVIG will harm your unborn baby.
  • are breastfeeding or plan to breastfeed. It is not known if SITAVIG passes into your breast milk.
  • Tell your healthcare provider about all the medicines you take, including prescription or over-the-counter medicines, vitamins, or herbal supplements.

How should I use SITAVIG?

See the detailed Instructions for Use for information about how to use SITAVIG.

  • Use SITAVIG exactly as your healthcare provider tells you to use it.
  • Use SITAVIG within 1 hour after you have the first symptom of a cold sore, such as itching, redness, burning, or tingling, and before a cold sore appears.
  • You may eat and drink while using SITAVIG.
  • Do not crush, chew, suck, or swallow SITAVIG tablets.
  • SITAVIG will slowly dissolve over time while in your mouth and should be left in place.
  • Gently rinse your mouth with water to clean your teeth while SITAVIG is in place.
  • Drink more liquids if your mouth becomes dry while using SITAVIG.

What should I avoid while using SITAVIG?

You should avoid activities that may prevent SITAVIG from sticking to your gum, including: touching or pressing SITAVIG after you apply it, wearing upper dentures, chewing gum, and brushing your teeth during the treatment day.

What are the possible side effects of SITAVIG?

The most common side effects of SITAVIG include: headache and pain where SITAVIG is applied.

These are not all the possible side effects of SITAVIG. Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.

How should I store SITAVIG?

  • Store SITAVIG between 68°F to 77°F (20°C to 25°C). Keep SITAVIG tablets dry.

Keep SITAVIG and all medicines out of the reach of children.

General information about the safe and effective use of SITAVIG

Medicines are sometimes prescribed for purposes other than those listed in a Patient Information leaflet. Do not use SITAVIG for a condition for which it was not prescribed. Do not give SITAVIG to other people, even if they have the same symptoms that you have. It may harm them. You can ask your pharmacist or healthcare provider for information about SITAVIG that is written for health professionals.

What are the ingredients in SITAVIG?

Active ingredient: acyclovir

Inactive ingredients: hypromellose, milk protein concentrate, sodium lauryl sulfate, magnesium stearate, microcrystalline cellulose, povidone, colloidal silicon dioxide.

Instructions for Use

(acyclovir) buccal tablets

Read the Instructions for Use that comes with SITAVIG before you start using it. Talk to your healthcare provider or pharmacist if you have any questions.


  • SITAVIG should be applied within 1 hour after you have the first symptom of a cold sore, such as itching, redness, burning, or tingling, and before a cold sore appears.
  • SITAVIG should be applied on the same side of your mouth as the cold sore symptoms.
  • SITAVIG should be applied to your upper gum, just above your incisor tooth.
  • SITAVIG should not be applied to the inside of your lip or your cheek.
  • If SITAVIG does not stick to your upper gum or falls off of your upper gum within the first 6 hours after you apply it, the same tablet should be placed back onto your upper gum right away. If this SITAVIG tablet does not stay in place, apply another SITAVIG tablet to your upper gum.
  • Do not re-apply SITAVIG if it falls out or you swallow it after it has been in place 6 hours or longer.
  • If you swallow SITAVIG within the first 6 hours of applying it, drink a glass of water and place a new SITAVIG tablet onto your upper gum.

How to apply SITAVIG:

Step 1: Before you apply SITAVIG, find the area on your upper gum, just above either the left or the right incisor. The incisor tooth is the tooth just to the right or left of your two front teeth (See Figure A). This is where you should apply SITAVIG.

Figure A

Area to apply tablet - Illustration

Step 2: Peel back the cover of the blister pack. Take 1 SITAVIG out of the blister pack. When removed from the blister pack, SITAVIG must be used right away. SITAVIG is round on one side and flat on the other side (See Figure B).

Figure B

SITAVIG Tablet appearance - Illustration

Step 3: Place the flat side of SITAVIG on your dry fingertip. Apply the round side of SITAVIG to your upper gum (See Figure C). The flat side will be facing the inside of your lip.

Figure C

Apply the round side of SITAVIG to your upper gum - Illustration

Step 4: Hold SITAVIG in place by applying a slight pressure with your finger on the outside of your upper lip, over the area where SITAVIG is placed, for 30 seconds. This will help SITAVIG stick to your gum (See Figure D).

Figure D

Hold SITAVIG in place - Illustration

Step 5: Leave the SITAVIG tablet in place until it dissolves.

This Instructions for Use has been approved by the U.S. Food and Drug Administration.

Last reviewed on RxList: 10/31/2016
This monograph has been modified to include the generic and brand name in many instances.

Report Problems to the Food and Drug Administration


You are encouraged to report negative side effects of prescription drugs to the FDA. Visit the FDA MedWatch website or call 1-800-FDA-1088.

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