Pentobarbital causes drowsiness. – Lactation: it is not known if basil is safe during breast-feeding. The medicinal parts of the basil plant are the leaves and the seeds. Pentobarbital interacts with HOLY BASIL. In theory, basil oils or extracts might increase the risk of bleeding during surgical procedures. Basil essential oil will retain the aroma of the herb, depending on the type that was used in the process of essential oil extraction.. Basil essential oil should be avoided during pregnancy since it can have an impact on hormonal levels as well as muscle and nerve function. There is some concern that taking holy basil seed oil with pentobarbital might cause too much drowsiness. Surgery: Basil oils and extracts might slow blood clotting. It’s also not appropriate for anyone with epilepsy. Avoid the following essential oils: aniseed, basil, camphor, cinnamon bark, clove bud, clove leaf, eucalyptus radiata fennel, hyssop, juniper, lemongrass, marjoram, nutmeg, oregano, parsley seed, peppermint (under 12), pennyroyal, sage, savory, tagetes and thyme. Best not used on children under 4 years old. Basil is a safe herb, on which no contraindications have been described, except in those situations in which the person is sensitive or allergic to its composition. Basil toxicity – The essential oil can cause dermatitis used in external application. – Dermatitis or redness of the skin: the essential oil can be irritating and should not be … The estragole can cause uterine contractions, so that basil is contraindicated during pregnancy. – At high doses it is considered narcotic. The flavors and scents of basil are so diverse that you can come across tastes and scents like citrus, licorice, cinnamon, and more. Interactions and Side Effects of Basil Essential Oil. Benzoin (Styrax benzoin) May cause some skin sensitivity. Avoid during pregnancy. – In internal use it may irritate the digestive mucosa and is not recommended in cases of gastritis. Bergamot (Citrus bergamia) Phototoxic – avoid … However, the consumption of basil essential oil is not advised in case of: Essential Oil: Contraindications: Basil (Ocimum basilicum) May irritate sensitive skin.